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Overview
Comment:Update the built-in SQLite to the latest 3.32.0 alpha that includes fixes for the DBCONFIG_MAINDBNAME problem.
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA3-256: 8d114c2aff3a24183204bc92024b8033dd2243534d4b17f1f11f3646a242e110
User & Date: drh 2020-03-22 14:29:25
Context
2020-03-22
15:02
Add the "raw" query parameter to the /tkthistory page. (check-in: 4c9e24fd user: drh tags: trunk)
14:29
Update the built-in SQLite to the latest 3.32.0 alpha that includes fixes for the DBCONFIG_MAINDBNAME problem. (check-in: 8d114c2a user: drh tags: trunk)
2020-03-21
19:57
Assorted improvements to www/globs.md, mainly to clarity and grammar. (check-in: 7898593d user: wyoung tags: trunk)
Changes
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static sqlite3 *globalDb = 0;

/*
** True if an interrupt (Control-C) has been received.
*/
static volatile int seenInterrupt = 0;










/*
** This is the name of our program. It is set in main(), used
** in a number of other places, mostly for error messages.
*/
static char *Argv0;

/*
................................................................................
#endif

/* Indicate out-of-memory and exit. */
static void shell_out_of_memory(void){
  raw_printf(stderr,"Error: out of memory\n");
  exit(1);
}












































/*
** Write I/O traces to the following stream.
*/
#ifdef SQLITE_ENABLE_IOTRACE
static FILE *iotrace = 0;
#endif
................................................................................
  ".explain ?on|off|auto?   Change the EXPLAIN formatting mode.  Default: auto",
  ".filectrl CMD ...        Run various sqlite3_file_control() operations",
  "                           Run \".filectrl\" with no arguments for details",
  ".fullschema ?--indent?   Show schema and the content of sqlite_stat tables",
  ".headers on|off          Turn display of headers on or off",
  ".help ?-all? ?PATTERN?   Show help text for PATTERN",
  ".import FILE TABLE       Import data from FILE into TABLE",












#ifndef SQLITE_OMIT_TEST_CONTROL
  ".imposter INDEX TABLE    Create imposter table TABLE on index INDEX",
#endif
  ".indexes ?TABLE?         Show names of indexes",
  "                           If TABLE is specified, only show indexes for",
  "                           tables matching TABLE using the LIKE operator.",
#ifdef SQLITE_ENABLE_IOTRACE
................................................................................
  "     tcl      TCL list elements",
  ".nullvalue STRING        Use STRING in place of NULL values",
  ".once (-e|-x|FILE)       Output for the next SQL command only to FILE",
  "     If FILE begins with '|' then open as a pipe",
  "     Other options:",
  "       -e    Invoke system text editor",
  "       -x    Open in a spreadsheet",



  ".open ?OPTIONS? ?FILE?   Close existing database and reopen FILE",
  "     Options:",
  "        --append        Use appendvfs to append database to the end of FILE",
#ifdef SQLITE_ENABLE_DESERIALIZE
  "        --deserialize   Load into memory useing sqlite3_deserialize()",
  "        --hexdb         Load the output of \"dbtotxt\" as an in-memory db",
  "        --maxsize N     Maximum size for --hexdb or --deserialized database",
................................................................................
struct ImportCtx {
  const char *zFile;  /* Name of the input file */
  FILE *in;           /* Read the CSV text from this input stream */
  char *z;            /* Accumulated text for a field */
  int n;              /* Number of bytes in z */
  int nAlloc;         /* Space allocated for z[] */
  int nLine;          /* Current line number */


  int bNotFirst;      /* True if one or more bytes already read */
  int cTerm;          /* Character that terminated the most recent field */
  int cColSep;        /* The column separator character.  (Usually ",") */
  int cRowSep;        /* The row separator character.  (Usually "\n") */
};

/* Append a single byte to z[] */
................................................................................
      }
    }else{
      showHelp(p->out, 0);
    }
  }else

  if( c=='i' && strncmp(azArg[0], "import", n)==0 ){
    char *zTable;               /* Insert data into this table */
    char *zFile;                /* Name of file to extra content from */
    sqlite3_stmt *pStmt = NULL; /* A statement */
    int nCol;                   /* Number of columns in the table */
    int nByte;                  /* Number of bytes in an SQL string */
    int i, j;                   /* Loop counters */
    int needCommit;             /* True to COMMIT or ROLLBACK at end */
    int nSep;                   /* Number of bytes in p->colSeparator[] */
    char *zSql;                 /* An SQL statement */
    ImportCtx sCtx;             /* Reader context */
    char *(SQLITE_CDECL *xRead)(ImportCtx*); /* Func to read one value */
    int (SQLITE_CDECL *xCloser)(FILE*);      /* Func to close file */




    if( nArg!=3 ){
      raw_printf(stderr, "Usage: .import FILE TABLE\n");
      goto meta_command_exit;





    }





    zFile = azArg[1];

    zTable = azArg[2];


































    seenInterrupt = 0;
    memset(&sCtx, 0, sizeof(sCtx));
    open_db(p, 0);



    nSep = strlen30(p->colSeparator);
    if( nSep==0 ){
      raw_printf(stderr,
                 "Error: non-null column separator required for import\n");
      return 1;

    }
    if( nSep>1 ){

      raw_printf(stderr, "Error: multi-character column separators not allowed"
                      " for import\n");
      return 1;

    }
    nSep = strlen30(p->rowSeparator);
    if( nSep==0 ){

      raw_printf(stderr, "Error: non-null row separator required for import\n");
      return 1;

    }
    if( nSep==2 && p->mode==MODE_Csv && strcmp(p->rowSeparator, SEP_CrLf)==0 ){
      /* When importing CSV (only), if the row separator is set to the
      ** default output row separator, change it to the default input
      ** row separator.  This avoids having to maintain different input
      ** and output row separators. */
      sqlite3_snprintf(sizeof(p->rowSeparator), p->rowSeparator, SEP_Row);
      nSep = strlen30(p->rowSeparator);
    }
    if( nSep>1 ){
      raw_printf(stderr, "Error: multi-character row separators not allowed"
                      " for import\n");
      return 1;




    }
    sCtx.zFile = zFile;
    sCtx.nLine = 1;
    if( sCtx.zFile[0]=='|' ){
#ifdef SQLITE_OMIT_POPEN
      raw_printf(stderr, "Error: pipes are not supported in this OS\n");
      return 1;

#else
      sCtx.in = popen(sCtx.zFile+1, "r");
      sCtx.zFile = "<pipe>";
      xCloser = pclose;
#endif
    }else{
      sCtx.in = fopen(sCtx.zFile, "rb");
      xCloser = fclose;
    }
    if( p->mode==MODE_Ascii ){
      xRead = ascii_read_one_field;
    }else{
      xRead = csv_read_one_field;
    }
    if( sCtx.in==0 ){
      utf8_printf(stderr, "Error: cannot open \"%s\"\n", zFile);
      return 1;

    }



    sCtx.cColSep = p->colSeparator[0];



    sCtx.cRowSep = p->rowSeparator[0];







    zSql = sqlite3_mprintf("SELECT * FROM %s", zTable);
    if( zSql==0 ){
      xCloser(sCtx.in);
      shell_out_of_memory();
    }
    nByte = strlen30(zSql);
    rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
................................................................................
        if( sCtx.cTerm!=sCtx.cColSep ) break;
      }
      if( cSep=='(' ){
        sqlite3_free(zCreate);
        sqlite3_free(sCtx.z);
        xCloser(sCtx.in);
        utf8_printf(stderr,"%s: empty file\n", sCtx.zFile);
        return 1;

      }
      zCreate = sqlite3_mprintf("%z\n)", zCreate);



      rc = sqlite3_exec(p->db, zCreate, 0, 0, 0);
      sqlite3_free(zCreate);
      if( rc ){
        utf8_printf(stderr, "CREATE TABLE %s(...) failed: %s\n", zTable,
                sqlite3_errmsg(p->db));
        sqlite3_free(sCtx.z);
        xCloser(sCtx.in);
        return 1;

      }
      rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
    }
    sqlite3_free(zSql);
    if( rc ){
      if (pStmt) sqlite3_finalize(pStmt);
      utf8_printf(stderr,"Error: %s\n", sqlite3_errmsg(p->db));
      xCloser(sCtx.in);
      return 1;

    }
    nCol = sqlite3_column_count(pStmt);
    sqlite3_finalize(pStmt);
    pStmt = 0;
    if( nCol==0 ) return 0; /* no columns, no error */
    zSql = sqlite3_malloc64( nByte*2 + 20 + nCol*2 );
    if( zSql==0 ){
................................................................................
    j = strlen30(zSql);
    for(i=1; i<nCol; i++){
      zSql[j++] = ',';
      zSql[j++] = '?';
    }
    zSql[j++] = ')';
    zSql[j] = 0;



    rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
    sqlite3_free(zSql);
    if( rc ){
      utf8_printf(stderr, "Error: %s\n", sqlite3_errmsg(p->db));
      if (pStmt) sqlite3_finalize(pStmt);
      xCloser(sCtx.in);
      return 1;

    }
    needCommit = sqlite3_get_autocommit(p->db);
    if( needCommit ) sqlite3_exec(p->db, "BEGIN", 0, 0, 0);
    do{
      int startLine = sCtx.nLine;
      for(i=0; i<nCol; i++){
        char *z = xRead(&sCtx);
................................................................................
      }
      if( i>=nCol ){
        sqlite3_step(pStmt);
        rc = sqlite3_reset(pStmt);
        if( rc!=SQLITE_OK ){
          utf8_printf(stderr, "%s:%d: INSERT failed: %s\n", sCtx.zFile,
                      startLine, sqlite3_errmsg(p->db));



        }
      }
    }while( sCtx.cTerm!=EOF );

    xCloser(sCtx.in);
    sqlite3_free(sCtx.z);
    sqlite3_finalize(pStmt);
    if( needCommit ) sqlite3_exec(p->db, "COMMIT", 0, 0, 0);





  }else

#ifndef SQLITE_UNTESTABLE
  if( c=='i' && strncmp(azArg[0], "imposter", n)==0 ){
    char *zSql;
    char *zCollist = 0;
    sqlite3_stmt *pStmt;
................................................................................
                       "%.*s", (int)ArraySize(p->nullValue)-1, azArg[1]);
    }else{
      raw_printf(stderr, "Usage: .nullvalue STRING\n");
      rc = 1;
    }
  }else





























  if( c=='o' && strncmp(azArg[0], "open", n)==0 && n>=2 ){
    char *zNewFilename;  /* Name of the database file to open */
    int iName = 1;       /* Index in azArg[] of the filename */
    int newFlag = 0;     /* True to delete file before opening */
    /* Close the existing database */
    session_close_all(p);
    close_db(p->db);
................................................................................
  int argcToFree = 0;
#endif

  setBinaryMode(stdin, 0);
  setvbuf(stderr, 0, _IONBF, 0); /* Make sure stderr is unbuffered */
  stdin_is_interactive = isatty(0);
  stdout_is_console = isatty(1);





#if !defined(_WIN32_WCE)
  if( getenv("SQLITE_DEBUG_BREAK") ){
    if( isatty(0) && isatty(2) ){
      fprintf(stderr,
          "attach debugger to process %d and press any key to continue.\n",
          GETPID());







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static sqlite3 *globalDb = 0;

/*
** True if an interrupt (Control-C) has been received.
*/
static volatile int seenInterrupt = 0;

#ifdef SQLITE_DEBUG
/*
** Out-of-memory simulator variables
*/
static unsigned int oomCounter = 0;    /* Simulate OOM when equals 1 */
static unsigned int oomRepeat = 0;     /* Number of OOMs in a row */
static void*(*defaultMalloc)(int) = 0; /* The low-level malloc routine */
#endif /* SQLITE_DEBUG */

/*
** This is the name of our program. It is set in main(), used
** in a number of other places, mostly for error messages.
*/
static char *Argv0;

/*
................................................................................
#endif

/* Indicate out-of-memory and exit. */
static void shell_out_of_memory(void){
  raw_printf(stderr,"Error: out of memory\n");
  exit(1);
}

#ifdef SQLITE_DEBUG
/* This routine is called when a simulated OOM occurs.  It is broken
** out as a separate routine to make it easy to set a breakpoint on
** the OOM
*/
void shellOomFault(void){
  if( oomRepeat>0 ){
    oomRepeat--;
  }else{
    oomCounter--;
  }
}
#endif /* SQLITE_DEBUG */

#ifdef SQLITE_DEBUG
/* This routine is a replacement malloc() that is used to simulate
** Out-Of-Memory (OOM) errors for testing purposes.
*/
static void *oomMalloc(int nByte){
  if( oomCounter ){
    if( oomCounter==1 ){
      shellOomFault();
      return 0;
    }else{
      oomCounter--;
    }
  }
  return defaultMalloc(nByte);
}
#endif /* SQLITE_DEBUG */

#ifdef SQLITE_DEBUG
/* Register the OOM simulator.  This must occur before any memory
** allocations */
static void registerOomSimulator(void){
  sqlite3_mem_methods mem;
  sqlite3_config(SQLITE_CONFIG_GETMALLOC, &mem);
  defaultMalloc = mem.xMalloc;
  mem.xMalloc = oomMalloc;
  sqlite3_config(SQLITE_CONFIG_MALLOC, &mem);
}
#endif

/*
** Write I/O traces to the following stream.
*/
#ifdef SQLITE_ENABLE_IOTRACE
static FILE *iotrace = 0;
#endif
................................................................................
  ".explain ?on|off|auto?   Change the EXPLAIN formatting mode.  Default: auto",
  ".filectrl CMD ...        Run various sqlite3_file_control() operations",
  "                           Run \".filectrl\" with no arguments for details",
  ".fullschema ?--indent?   Show schema and the content of sqlite_stat tables",
  ".headers on|off          Turn display of headers on or off",
  ".help ?-all? ?PATTERN?   Show help text for PATTERN",
  ".import FILE TABLE       Import data from FILE into TABLE",
  "   Options:",
  "     --ascii               Use \\037 and \\036 as column and row separators",
  "     --csv                 Use , and \\n as column and row separators",
  "     --skip N              Skip the first N rows of input",
  "     -v                    \"Verbose\" - increase auxiliary output",
  "   Notes:",
  "     *  If TABLE does not exist, it is created.  The first row of input",
  "        determines the column names.",
  "     *  If neither --csv or --ascii are used, the input mode is derived",
  "        from the \".mode\" output mode",
  "     *  If FILE begins with \"|\" then it is a command that generates the",
  "        input text.",
#ifndef SQLITE_OMIT_TEST_CONTROL
  ".imposter INDEX TABLE    Create imposter table TABLE on index INDEX",
#endif
  ".indexes ?TABLE?         Show names of indexes",
  "                           If TABLE is specified, only show indexes for",
  "                           tables matching TABLE using the LIKE operator.",
#ifdef SQLITE_ENABLE_IOTRACE
................................................................................
  "     tcl      TCL list elements",
  ".nullvalue STRING        Use STRING in place of NULL values",
  ".once (-e|-x|FILE)       Output for the next SQL command only to FILE",
  "     If FILE begins with '|' then open as a pipe",
  "     Other options:",
  "       -e    Invoke system text editor",
  "       -x    Open in a spreadsheet",
#ifdef SQLITE_DEBUG
  ".oom [--repeat M] [N]    Simulate an OOM error on the N-th allocation",
#endif 
  ".open ?OPTIONS? ?FILE?   Close existing database and reopen FILE",
  "     Options:",
  "        --append        Use appendvfs to append database to the end of FILE",
#ifdef SQLITE_ENABLE_DESERIALIZE
  "        --deserialize   Load into memory useing sqlite3_deserialize()",
  "        --hexdb         Load the output of \"dbtotxt\" as an in-memory db",
  "        --maxsize N     Maximum size for --hexdb or --deserialized database",
................................................................................
struct ImportCtx {
  const char *zFile;  /* Name of the input file */
  FILE *in;           /* Read the CSV text from this input stream */
  char *z;            /* Accumulated text for a field */
  int n;              /* Number of bytes in z */
  int nAlloc;         /* Space allocated for z[] */
  int nLine;          /* Current line number */
  int nRow;           /* Number of rows imported */
  int nErr;           /* Number of errors encountered */
  int bNotFirst;      /* True if one or more bytes already read */
  int cTerm;          /* Character that terminated the most recent field */
  int cColSep;        /* The column separator character.  (Usually ",") */
  int cRowSep;        /* The row separator character.  (Usually "\n") */
};

/* Append a single byte to z[] */
................................................................................
      }
    }else{
      showHelp(p->out, 0);
    }
  }else

  if( c=='i' && strncmp(azArg[0], "import", n)==0 ){
    char *zTable = 0;           /* Insert data into this table */
    char *zFile = 0;            /* Name of file to extra content from */
    sqlite3_stmt *pStmt = NULL; /* A statement */
    int nCol;                   /* Number of columns in the table */
    int nByte;                  /* Number of bytes in an SQL string */
    int i, j;                   /* Loop counters */
    int needCommit;             /* True to COMMIT or ROLLBACK at end */
    int nSep;                   /* Number of bytes in p->colSeparator[] */
    char *zSql;                 /* An SQL statement */
    ImportCtx sCtx;             /* Reader context */
    char *(SQLITE_CDECL *xRead)(ImportCtx*); /* Func to read one value */
    int (SQLITE_CDECL *xCloser)(FILE*);      /* Func to close file */
    int eVerbose = 0;           /* Larger for more console output */
    int nSkip = 0;              /* Initial lines to skip */
    int useOutputMode = 1;      /* Use output mode to determine separators */




    memset(&sCtx, 0, sizeof(sCtx));
    if( p->mode==MODE_Ascii ){
      xRead = ascii_read_one_field;
    }else{
      xRead = csv_read_one_field;
    }
    for(i=1; i<nArg; i++){
      char *z = azArg[i];
      if( z[0]=='-' && z[1]=='-' ) z++;
      if( z[0]!='-' ){
        if( zFile==0 ){
          zFile = z;
        }else if( zTable==0 ){
          zTable = z;
        }else{
          utf8_printf(p->out, "ERROR: extra argument: \"%s\".  Usage:\n", z);
          showHelp(p->out, "import");
          rc = 1;
          goto meta_command_exit;
        }
      }else if( strcmp(z,"-v")==0 ){
        eVerbose++;
      }else if( strcmp(z,"-skip")==0 && i<nArg-1 ){
        nSkip = integerValue(azArg[++i]);
      }else if( strcmp(z,"-ascii")==0 ){
        sCtx.cColSep = SEP_Unit[0];
        sCtx.cRowSep = SEP_Record[0];
        xRead = ascii_read_one_field;
        useOutputMode = 0;
      }else if( strcmp(z,"-csv")==0 ){
        sCtx.cColSep = ',';
        sCtx.cRowSep = '\n';
        xRead = csv_read_one_field;
        useOutputMode = 0;
      }else{
        utf8_printf(p->out, "ERROR: unknown option: \"%s\".  Usage:\n", z);
        showHelp(p->out, "import");
        rc = 1;
        goto meta_command_exit;
      }
    }
    if( zTable==0 ){
      utf8_printf(p->out, "ERROR: missing %s argument. Usage:\n",
                  zFile==0 ? "FILE" : "TABLE");
      showHelp(p->out, "import");
      rc = 1;
      goto meta_command_exit;
    }
    seenInterrupt = 0;

    open_db(p, 0);
    if( useOutputMode ){
      /* If neither the --csv or --ascii options are specified, then set
      ** the column and row separator characters from the output mode. */
      nSep = strlen30(p->colSeparator);
      if( nSep==0 ){
        raw_printf(stderr,
                   "Error: non-null column separator required for import\n");
        rc = 1;
        goto meta_command_exit;
      }
      if( nSep>1 ){
        raw_printf(stderr, 
              "Error: multi-character column separators not allowed"
              " for import\n");
        rc = 1;
        goto meta_command_exit;
      }
      nSep = strlen30(p->rowSeparator);
      if( nSep==0 ){
        raw_printf(stderr,
            "Error: non-null row separator required for import\n");
        rc = 1;
        goto meta_command_exit;
      }
      if( nSep==2 && p->mode==MODE_Csv && strcmp(p->rowSeparator,SEP_CrLf)==0 ){
        /* When importing CSV (only), if the row separator is set to the
        ** default output row separator, change it to the default input
        ** row separator.  This avoids having to maintain different input
        ** and output row separators. */
        sqlite3_snprintf(sizeof(p->rowSeparator), p->rowSeparator, SEP_Row);
        nSep = strlen30(p->rowSeparator);
      }
      if( nSep>1 ){
        raw_printf(stderr, "Error: multi-character row separators not allowed"
                           " for import\n");
        rc = 1;
        goto meta_command_exit;
      }
      sCtx.cColSep = p->colSeparator[0];
      sCtx.cRowSep = p->rowSeparator[0];
    }
    sCtx.zFile = zFile;
    sCtx.nLine = 1;
    if( sCtx.zFile[0]=='|' ){
#ifdef SQLITE_OMIT_POPEN
      raw_printf(stderr, "Error: pipes are not supported in this OS\n");
      rc = 1;
      goto meta_command_exit;
#else
      sCtx.in = popen(sCtx.zFile+1, "r");
      sCtx.zFile = "<pipe>";
      xCloser = pclose;
#endif
    }else{
      sCtx.in = fopen(sCtx.zFile, "rb");
      xCloser = fclose;
    }





    if( sCtx.in==0 ){
      utf8_printf(stderr, "Error: cannot open \"%s\"\n", zFile);
      rc = 1;
      goto meta_command_exit;
    }
    if( eVerbose>=2 || (eVerbose>=1 && useOutputMode) ){
      char zSep[2];
      zSep[1] = 0;
      zSep[0] = sCtx.cColSep;
      utf8_printf(p->out, "Column separator ");
      output_c_string(p->out, zSep);
      utf8_printf(p->out, ", row separator ");
      zSep[0] = sCtx.cRowSep;
      output_c_string(p->out, zSep);
      utf8_printf(p->out, "\n");
    }
    while( (nSkip--)>0 ){
      while( xRead(&sCtx) && sCtx.cTerm==sCtx.cColSep ){}
      sCtx.nLine++;
    }
    zSql = sqlite3_mprintf("SELECT * FROM %s", zTable);
    if( zSql==0 ){
      xCloser(sCtx.in);
      shell_out_of_memory();
    }
    nByte = strlen30(zSql);
    rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
................................................................................
        if( sCtx.cTerm!=sCtx.cColSep ) break;
      }
      if( cSep=='(' ){
        sqlite3_free(zCreate);
        sqlite3_free(sCtx.z);
        xCloser(sCtx.in);
        utf8_printf(stderr,"%s: empty file\n", sCtx.zFile);
        rc = 1;
        goto meta_command_exit;
      }
      zCreate = sqlite3_mprintf("%z\n)", zCreate);
      if( eVerbose>=1 ){
        utf8_printf(p->out, "%s\n", zCreate);
      }
      rc = sqlite3_exec(p->db, zCreate, 0, 0, 0);
      sqlite3_free(zCreate);
      if( rc ){
        utf8_printf(stderr, "CREATE TABLE %s(...) failed: %s\n", zTable,
                sqlite3_errmsg(p->db));
        sqlite3_free(sCtx.z);
        xCloser(sCtx.in);
        rc = 1;
        goto meta_command_exit;
      }
      rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
    }
    sqlite3_free(zSql);
    if( rc ){
      if (pStmt) sqlite3_finalize(pStmt);
      utf8_printf(stderr,"Error: %s\n", sqlite3_errmsg(p->db));
      xCloser(sCtx.in);
      rc = 1;
      goto meta_command_exit;
    }
    nCol = sqlite3_column_count(pStmt);
    sqlite3_finalize(pStmt);
    pStmt = 0;
    if( nCol==0 ) return 0; /* no columns, no error */
    zSql = sqlite3_malloc64( nByte*2 + 20 + nCol*2 );
    if( zSql==0 ){
................................................................................
    j = strlen30(zSql);
    for(i=1; i<nCol; i++){
      zSql[j++] = ',';
      zSql[j++] = '?';
    }
    zSql[j++] = ')';
    zSql[j] = 0;
    if( eVerbose>=2 ){
      utf8_printf(p->out, "Insert using: %s\n", zSql);
    }
    rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
    sqlite3_free(zSql);
    if( rc ){
      utf8_printf(stderr, "Error: %s\n", sqlite3_errmsg(p->db));
      if (pStmt) sqlite3_finalize(pStmt);
      xCloser(sCtx.in);
      rc = 1;
      goto meta_command_exit;
    }
    needCommit = sqlite3_get_autocommit(p->db);
    if( needCommit ) sqlite3_exec(p->db, "BEGIN", 0, 0, 0);
    do{
      int startLine = sCtx.nLine;
      for(i=0; i<nCol; i++){
        char *z = xRead(&sCtx);
................................................................................
      }
      if( i>=nCol ){
        sqlite3_step(pStmt);
        rc = sqlite3_reset(pStmt);
        if( rc!=SQLITE_OK ){
          utf8_printf(stderr, "%s:%d: INSERT failed: %s\n", sCtx.zFile,
                      startLine, sqlite3_errmsg(p->db));
          sCtx.nErr++;
        }else{
          sCtx.nRow++;
        }
      }
    }while( sCtx.cTerm!=EOF );

    xCloser(sCtx.in);
    sqlite3_free(sCtx.z);
    sqlite3_finalize(pStmt);
    if( needCommit ) sqlite3_exec(p->db, "COMMIT", 0, 0, 0);
    if( eVerbose>0 ){
      utf8_printf(p->out,
          "Added %d rows with %d errors using %d lines of input\n",
          sCtx.nRow, sCtx.nErr, sCtx.nLine-1);
    }
  }else

#ifndef SQLITE_UNTESTABLE
  if( c=='i' && strncmp(azArg[0], "imposter", n)==0 ){
    char *zSql;
    char *zCollist = 0;
    sqlite3_stmt *pStmt;
................................................................................
                       "%.*s", (int)ArraySize(p->nullValue)-1, azArg[1]);
    }else{
      raw_printf(stderr, "Usage: .nullvalue STRING\n");
      rc = 1;
    }
  }else

#ifdef SQLITE_DEBUG
  if( c=='o' && strcmp(azArg[0],"oom")==0 ){
    int i;
    for(i=1; i<nArg; i++){
      const char *z = azArg[i];
      if( z[0]=='-' && z[1]=='-' ) z++;
      if( strcmp(z,"-repeat")==0 ){
        if( i==nArg-1 ){
          raw_printf(p->out, "missing argument on \"%s\"\n", azArg[i]);
          rc = 1;
        }else{
          oomRepeat = (int)integerValue(azArg[++i]);
        }
      }else if( IsDigit(z[0]) ){
        oomCounter = (int)integerValue(azArg[i]);
      }else{
        raw_printf(p->out, "unknown argument: \"%s\"\n", azArg[i]);
        raw_printf(p->out, "Usage: .oom [--repeat N] [M]\n");
        rc = 1;
      }
    }
    if( rc==0 ){
      raw_printf(p->out, "oomCounter = %d\n", oomCounter);
      raw_printf(p->out, "oomRepeat  = %d\n", oomRepeat);
    }
  }else
#endif /* SQLITE_DEBUG */

  if( c=='o' && strncmp(azArg[0], "open", n)==0 && n>=2 ){
    char *zNewFilename;  /* Name of the database file to open */
    int iName = 1;       /* Index in azArg[] of the filename */
    int newFlag = 0;     /* True to delete file before opening */
    /* Close the existing database */
    session_close_all(p);
    close_db(p->db);
................................................................................
  int argcToFree = 0;
#endif

  setBinaryMode(stdin, 0);
  setvbuf(stderr, 0, _IONBF, 0); /* Make sure stderr is unbuffered */
  stdin_is_interactive = isatty(0);
  stdout_is_console = isatty(1);

#ifdef SQLITE_DEBUG
  registerOomSimulator();
#endif

#if !defined(_WIN32_WCE)
  if( getenv("SQLITE_DEBUG_BREAK") ){
    if( isatty(0) && isatty(2) ){
      fprintf(stderr,
          "attach debugger to process %d and press any key to continue.\n",
          GETPID());

Changes to src/sqlite3.c.

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.....
98737
98738
98739
98740
98741
98742
98743
98744
98745
98746
98747
98748
98749
98750
98751
98752
98753
98754
98755
98756
98757
98758
98759
98760
98761
98762
98763
98764
98765
98766
98767
98768
98769
98770
98771
98772
.....
98780
98781
98782
98783
98784
98785
98786
98787
98788
98789
98790
98791
98792
98793
98794
.....
98803
98804
98805
98806
98807
98808
98809
98810
98811
98812
98813
98814
98815
98816
98817
.....
98818
98819
98820
98821
98822
98823
98824
98825




98826
98827
98828
98829
98830
98831
98832
.....
98838
98839
98840
98841
98842
98843
98844
98845
98846
98847
98848
98849
98850
98851
98852
98853
.....
98864
98865
98866
98867
98868
98869
98870
98871
98872
98873
98874
98875
98876
98877
98878
.....
99107
99108
99109
99110
99111
99112
99113

99114
99115
99116
99117
99118
99119
99120
.....
99719
99720
99721
99722
99723
99724
99725
99726
99727
99728
99729
99730
99731
99732
99733
.....
99824
99825
99826
99827
99828
99829
99830




99831
99832
99833
99834
99835
99836
99837
......
100600
100601
100602
100603
100604
100605
100606
100607
100608
100609
100610
100611
100612
100613
100614
......
101363
101364
101365
101366
101367
101368
101369

101370
101371
101372
101373
101374
101375
101376
......
101683
101684
101685
101686
101687
101688
101689

101690
101691
101692
101693
101694
101695
101696
......
102009
102010
102011
102012
102013
102014
102015
102016
102017
102018
102019
102020
102021
102022
102023
......
102293
102294
102295
102296
102297
102298
102299

102300
102301
102302
102303
102304
102305
102306
102307
102308
102309

102310
102311








102312
102313
102314
102315
102316
102317
102318
......
102547
102548
102549
102550
102551
102552
102553

102554
102555
102556
102557
102558
102559
102560
......
102618
102619
102620
102621
102622
102623
102624
102625
102626
102627
102628
102629
102630
102631
102632
102633
102634
102635
102636
102637
102638
102639
102640
102641
......
103001
103002
103003
103004
103005
103006
103007
103008






103009
103010
103011
103012
103013
103014


103015
103016
103017
103018
103019
103020
103021
103022
103023
......
103027
103028
103029
103030
103031
103032
103033














103034
103035
103036
103037
103038
103039
103040
103041

103042
103043
103044
103045
103046
103047
103048
......
103059
103060
103061
103062
103063
103064
103065
103066
103067
103068
103069
103070
103071
103072
103073
......
103081
103082
103083
103084
103085
103086
103087

103088
103089
103090
103091
103092
103093
103094
......
103115
103116
103117
103118
103119
103120
103121
103122
103123
103124
103125
103126
103127
103128
103129
103130
103131
......
103175
103176
103177
103178
103179
103180
103181
103182
103183
103184
103185
103186
103187
103188
103189
......
103298
103299
103300
103301
103302
103303
103304

103305
103306
103307
103308
103309
103310
103311
......
103439
103440
103441
103442
103443
103444
103445

103446
103447
103448
103449
103450
103451
103452
......
103722
103723
103724
103725
103726
103727
103728
103729
103730
103731
103732
103733
103734
103735
103736
103737
103738
103739
103740
103741
103742
103743
103744
103745
103746
103747
103748
103749
103750
103751
103752
103753
103754
103755
103756
103757
103758
103759
103760
103761
......
106440
106441
106442
106443
106444
106445
106446
106447
106448
106449
106450
106451
106452
106453
106454
106455
106456
......
106457
106458
106459
106460
106461
106462
106463
106464

106465
106466
106467
106468



106469
106470
106471
106472
106473
106474
106475
106476
106477
106478
106479
106480
106481
106482
106483
106484
106485
106486
106487
106488
106489
106490
106491
106492
106493
106494
106495
106496
106497
106498
106499
106500
106501
106502
106503
......
106505
106506
106507
106508
106509
106510
106511
106512
106513
106514
106515
106516
106517
106518
106519
106520
106521
106522
106523
106524
106525
106526
106527
106528
106529
106530
106531
106532
......
106534
106535
106536
106537
106538
106539
106540
106541
106542
106543
106544
106545
106546
106547
106548
106549
106550
106551
......
106565
106566
106567
106568
106569
106570
106571
106572
106573
106574
106575
106576
106577
106578
106579
106580
106581
106582
106583
106584
106585
106586
106587
106588
106589
......
106594
106595
106596
106597
106598
106599
106600
106601
106602
106603
106604
106605
106606
106607
106608
106609
106610
106611
106612
106613
106614
......
106629
106630
106631
106632
106633
106634
106635
106636
106637
106638
106639
106640
106641
106642
106643
106644
......
106650
106651
106652
106653
106654
106655
106656
106657
106658
106659
106660
106661
106662
106663
106664
......
106677
106678
106679
106680
106681
106682
106683
106684
106685
106686
106687
106688
106689
106690
106691
106692
106693
......
106701
106702
106703
106704
106705
106706
106707
106708
106709
106710
106711
106712
106713
106714
106715
106716
106717
......
106723
106724
106725
106726
106727
106728
106729
106730
106731
106732
106733
106734
106735
106736
106737
106738
106739
106740
106741
106742
106743
106744
106745
106746
106747
106748
106749
106750
106751
106752
106753
106754
106755
106756
106757
106758
106759
106760
......
106765
106766
106767
106768
106769
106770
106771
106772
106773
106774
106775
106776
106777
106778
106779
......
106808
106809
106810
106811
106812
106813
106814

106815
106816
106817
106818
106819
106820
106821
106822
106823
106824
106825
106826
106827
106828
106829
106830
106831
106832
106833
106834
106835
......
106845
106846
106847
106848
106849
106850
106851
106852
106853
106854
106855
106856
106857
106858
106859
106860
106861
106862
106863
106864
106865
106866
106867
106868
106869
106870
106871
106872
106873
106874
106875
106876
106877
106878
106879
106880
106881
106882
106883
106884
106885
106886
106887
106888
106889
106890
106891
106892
106893
106894
106895
106896

106897

106898
106899
106900
106901
106902
106903
106904
......
106959
106960
106961
106962
106963
106964
106965
106966
106967
106968
106969
106970
106971
106972
106973
106974
106975
106976
106977
106978
106979
106980
106981
106982
106983
106984
106985
106986
106987
106988
106989
106990
106991
106992
106993
106994
......
107001
107002
107003
107004
107005
107006
107007
107008
107009
107010
107011
107012
107013
107014
107015
......
107044
107045
107046
107047
107048
107049
107050
107051
107052
107053
107054
107055
107056
107057
107058
......
107135
107136
107137
107138
107139
107140
107141
107142
107143
107144
107145
107146
107147
107148
107149
......
108103
108104
108105
108106
108107
108108
108109











108110
108111
108112
108113
108114
108115
108116
......
108176
108177
108178
108179
108180
108181
108182
108183
108184
108185
108186
108187
108188
108189
108190
108191
108192
......
108331
108332
108333
108334
108335
108336
108337
108338
108339
108340
108341
108342
108343
108344
108345
......
108522
108523
108524
108525
108526
108527
108528
108529
108530


108531
108532
108533

108534
108535
108536

108537
108538
108539
108540
108541
108542
108543
108544
108545
108546
108547
108548
108549
......
109260
109261
109262
109263
109264
109265
109266
109267
109268
109269
109270
109271
109272
109273
109274
......
109382
109383
109384
109385
109386
109387
109388
109389
109390
109391
109392
109393
109394
109395
109396
......
111101
111102
111103
111104
111105
111106
111107


























111108
111109
111110
111111
111112
111113
111114
......
111194
111195
111196
111197
111198
111199
111200


111201
111202
111203
111204
111205
111206
111207
......
114135
114136
114137
114138
114139
114140
114141


114142
114143

114144
114145
114146
114147
114148
114149
114150
114151













114152
114153
114154
114155
114156
114157
114158
......
116319
116320
116321
116322
116323
116324
116325

116326
116327
116328
116329
116330
116331
116332
......
116354
116355
116356
116357
116358
116359
116360






116361
116362
116363
116364
116365
116366
116367
......
117336
117337
117338
117339
117340
117341
117342
117343
117344
117345
117346
117347
117348
117349
117350
117351
117352
117353
117354
117355
117356
117357
117358
117359
117360
117361














117362
117363
117364
117365
117366
117367
117368
......
120562
120563
120564
120565
120566
120567
120568
120569
120570
120571
120572
120573
120574
120575
120576
......
120617
120618
120619
120620
120621
120622
120623

120624
120625
120626
120627
120628
120629
120630
......
120631
120632
120633
120634
120635
120636
120637


120638


120639
120640
120641
120642
120643
120644
120645
......
125950
125951
125952
125953
125954
125955
125956
125957
125958
125959
125960
125961
125962
125963
125964
125965
125966
125967
125968
125969
125970
125971


125972
125973
125974
125975
125976
125977
125978
......
126773
126774
126775
126776
126777
126778
126779
126780
126781
126782
126783
126784
126785
126786
126787
......
126861
126862
126863
126864
126865
126866
126867

126868
126869
126870
126871
126872
126873
126874
......
126889
126890
126891
126892
126893
126894
126895

126896
126897
126898
126899
126900
126901
126902
......
126948
126949
126950
126951
126952
126953
126954
126955
126956
126957

126958
126959
126960
126961
126962
126963
126964

126965
126966
126967
126968
126969
126970
126971
126972
126973
126974
126975
126976
126977
126978
126979
126980
126981
126982
......
127080
127081
127082
127083
127084
127085
127086
127087
127088
127089
127090
127091
127092
127093
127094
127095
......
127717
127718
127719
127720
127721
127722
127723
127724
127725
127726
127727
127728
127729
127730
127731
......
131195
131196
131197
131198
131199
131200
131201
































131202
131203
131204
131205
131206
131207
131208
......
131733
131734
131735
131736
131737
131738
131739






131740
131741
131742
131743
131744
131745
131746
......
135182
135183
135184
135185
135186
135187
135188
135189
135190
135191
135192
135193
135194
135195
135196
......
141204
141205
141206
141207
141208
141209
141210



141211
141212
141213
141214
141215
141216
141217
......
148757
148758
148759
148760
148761
148762
148763
148764
148765
148766
148767
148768
148769
148770
148771
......
148915
148916
148917
148918
148919
148920
148921
148922
148923
148924
148925
148926
148927
148928
148929
148930
148931
148932
148933
148934
148935
148936
148937
148938

148939
148940






148941
148942
148943
148944
148945
148946
148947
......
150051
150052
150053
150054
150055
150056
150057

150058
150059
150060
150061
150062
150063
150064
......
150140
150141
150142
150143
150144
150145
150146

150147
150148
150149
150150
150151
150152
150153
......
151028
151029
151030
151031
151032
151033
151034

151035
151036
151037
151038
151039
151040
151041
......
151406
151407
151408
151409
151410
151411
151412




151413
151414
151415
151416
151417
151418
151419
......
152243
152244
152245
152246
152247
152248
152249

152250
152251
152252
152253
152254
152255
152256
......
162082
162083
162084
162085
162086
162087
162088
162089
162090
162091
162092
162093
162094
162095
162096
162097
162098
162099
162100
......
162131
162132
162133
162134
162135
162136
162137
162138


162139
162140
162141
162142
162143
162144
162145
......
166662
166663
166664
166665
166666
166667
166668

166669
166670
166671
166672
166673
166674
166675
......
166686
166687
166688
166689
166690
166691
166692
166693
166694
166695
166696
166697
166698




166699
166700
166701
166702
166703
166704
166705
......
179914
179915
179916
179917
179918
179919
179920






179921
179922
179923
179924
179925
179926
179927
......
189650
189651
189652
189653
189654
189655
189656

189657

189658
189659
189660
189661
189662
189663
189664
189665
......
192387
192388
192389
192390
192391
192392
192393
192394
192395
192396
192397
192398
192399
192400
192401
......
192413
192414
192415
192416
192417
192418
192419
192420
192421
192422
192423
192424
192425
192426
192427
192428
192429
192430
192431
192432
......
199220
199221
199222
199223
199224
199225
199226

199227
199228
199229
199230
199231
199232
199233
......
199434
199435
199436
199437
199438
199439
199440

199441

199442
199443
199444
199445
199446
199447
199448
......
203767
203768
203769
203770
203771
203772
203773
203774
203775
203776
203777
203778
203779
203780
203781
......
203850
203851
203852
203853
203854
203855
203856
203857
203858
203859
203860
203861
203862
203863
203864
......
223536
223537
223538
223539
223540
223541
223542
223543
223544
223545
223546
223547
223548
223549
223550
......
228318
228319
228320
228321
228322
228323
228324
228325
228326
228327
228328
228329
228330
228331
**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.32.0"
#define SQLITE_VERSION_NUMBER 3032000
#define SQLITE_SOURCE_ID      "2020-02-27 16:21:39 951b39ca74c9bd933139e099d5555283278db475f410f202c162e5d1e6aef933"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
................................................................................
**
** DB_UnresetViews means that one or more views have column names that
** have been filled out.  If the schema changes, these column names might
** changes and so the view will need to be reset.
*/
#define DB_SchemaLoaded    0x0001  /* The schema has been loaded */
#define DB_UnresetViews    0x0002  /* Some views have defined column names */
#define DB_Empty           0x0004  /* The file is empty (length 0 bytes) */
#define DB_ResetWanted     0x0008  /* Reset the schema when nSchemaLock==0 */

/*
** The number of different kinds of things that can be limited
** using the sqlite3_limit() interface.
*/
#define SQLITE_N_LIMIT (SQLITE_LIMIT_WORKER_THREADS+1)
................................................................................

/*
** Each database connection is an instance of the following structure.
*/
struct sqlite3 {
  sqlite3_vfs *pVfs;            /* OS Interface */
  struct Vdbe *pVdbe;           /* List of active virtual machines */
  CollSeq *pDfltColl;           /* The default collating sequence (BINARY) */
  sqlite3_mutex *mutex;         /* Connection mutex */
  Db *aDb;                      /* All backends */
  int nDb;                      /* Number of backends currently in use */
  u32 mDbFlags;                 /* flags recording internal state */
  u64 flags;                    /* flags settable by pragmas. See below */
  i64 lastRowid;                /* ROWID of most recent insert (see above) */
  i64 szMmap;                   /* Default mmap_size setting */
................................................................................
*/
#define DBFLAG_SchemaChange   0x0001  /* Uncommitted Hash table changes */
#define DBFLAG_PreferBuiltin  0x0002  /* Preference to built-in funcs */
#define DBFLAG_Vacuum         0x0004  /* Currently in a VACUUM */
#define DBFLAG_VacuumInto     0x0008  /* Currently running VACUUM INTO */
#define DBFLAG_SchemaKnownOk  0x0010  /* Schema is known to be valid */
#define DBFLAG_InternalFunc   0x0020  /* Allow use of internal functions */


/*
** Bits of the sqlite3.dbOptFlags field that are used by the
** sqlite3_test_control(SQLITE_TESTCTRL_OPTIMIZATIONS,...) interface to
** selectively disable various optimizations.
*/
#define SQLITE_QueryFlattener 0x0001   /* Query flattening */
................................................................................
struct Expr {
  u8 op;                 /* Operation performed by this node */
  char affExpr;          /* affinity, or RAISE type */
  u8 op2;                /* TK_REGISTER/TK_TRUTH: original value of Expr.op
                         ** TK_COLUMN: the value of p5 for OP_Column
                         ** TK_AGG_FUNCTION: nesting depth
                         ** TK_FUNCTION: NC_SelfRef flag if needs OP_PureFunc */



  u32 flags;             /* Various flags.  EP_* See below */
  union {
    char *zToken;          /* Token value. Zero terminated and dequoted */
    int iValue;            /* Non-negative integer value if EP_IntValue */
  } u;

  /* If the EP_TokenOnly flag is set in the Expr.flags mask, then no
................................................................................
#define EP_IntValue   0x000400 /* Integer value contained in u.iValue */
#define EP_xIsSelect  0x000800 /* x.pSelect is valid (otherwise x.pList is) */
#define EP_Skip       0x001000 /* Operator does not contribute to affinity */
#define EP_Reduced    0x002000 /* Expr struct EXPR_REDUCEDSIZE bytes only */
#define EP_TokenOnly  0x004000 /* Expr struct EXPR_TOKENONLYSIZE bytes only */
#define EP_Win        0x008000 /* Contains window functions */
#define EP_MemToken   0x010000 /* Need to sqlite3DbFree() Expr.zToken */
#define EP_NoReduce   0x020000 /* Cannot EXPRDUP_REDUCE this Expr */
#define EP_Unlikely   0x040000 /* unlikely() or likelihood() function */
#define EP_ConstFunc  0x080000 /* A SQLITE_FUNC_CONSTANT or _SLOCHNG function */
#define EP_CanBeNull  0x100000 /* Can be null despite NOT NULL constraint */
#define EP_Subquery   0x200000 /* Tree contains a TK_SELECT operator */
#define EP_Alias      0x400000 /* Is an alias for a result set column */
#define EP_Leaf       0x800000 /* Expr.pLeft, .pRight, .u.pSelect all NULL */
#define EP_WinFunc   0x1000000 /* TK_FUNCTION with Expr.y.pWin set */
#define EP_Subrtn    0x2000000 /* Uses Expr.y.sub. TK_IN, _SELECT, or _EXISTS */
#define EP_Quoted    0x4000000 /* TK_ID was originally quoted */
#define EP_Static    0x8000000 /* Held in memory not obtained from malloc() */
#define EP_IsTrue   0x10000000 /* Always has boolean value of TRUE */
#define EP_IsFalse  0x20000000 /* Always has boolean value of FALSE */
#define EP_FromDDL  0x40000000 /* Originates from sqlite_master */


/*
** The EP_Propagate mask is a set of properties that automatically propagate
** upwards into parent nodes.
*/
#define EP_Propagate (EP_Collate|EP_Subquery|EP_HasFunc)

................................................................................
#define ExprHasProperty(E,P)     (((E)->flags&(P))!=0)
#define ExprHasAllProperty(E,P)  (((E)->flags&(P))==(P))
#define ExprSetProperty(E,P)     (E)->flags|=(P)
#define ExprClearProperty(E,P)   (E)->flags&=~(P)
#define ExprAlwaysTrue(E)   (((E)->flags&(EP_FromJoin|EP_IsTrue))==EP_IsTrue)
#define ExprAlwaysFalse(E)  (((E)->flags&(EP_FromJoin|EP_IsFalse))==EP_IsFalse)







/* The ExprSetVVAProperty() macro is used for Verification, Validation,
** and Accreditation only.  It works like ExprSetProperty() during VVA
** processes but is a no-op for delivery.
*/
#ifdef SQLITE_DEBUG
# define ExprSetVVAProperty(E,P)  (E)->flags|=(P)


#else
# define ExprSetVVAProperty(E,P)


#endif

/*
** Macros to determine the number of bytes required by a normal Expr
** struct, an Expr struct with the EP_Reduced flag set in Expr.flags
** and an Expr struct with the EP_TokenOnly flag set.
*/
................................................................................
    struct IdxExprTrans *pIdxTrans;           /* Convert idxed expr to column */
    ExprList *pGroupBy;                       /* GROUP BY clause */
    Select *pSelect;                          /* HAVING to WHERE clause ctx */
    struct WindowRewrite *pRewrite;           /* Window rewrite context */
    struct WhereConst *pConst;                /* WHERE clause constants */
    struct RenameCtx *pRename;                /* RENAME COLUMN context */
    struct Table *pTab;                       /* Table of generated column */

  } u;
};

/* Forward declarations */
SQLITE_PRIVATE int sqlite3WalkExpr(Walker*, Expr*);
SQLITE_PRIVATE int sqlite3WalkExprList(Walker*, ExprList*);
SQLITE_PRIVATE int sqlite3WalkSelect(Walker*, Select*);
................................................................................
SQLITE_PRIVATE void sqlite3ExprCodeMove(Parse*, int, int, int);
SQLITE_PRIVATE void sqlite3ExprCode(Parse*, Expr*, int);
#ifndef SQLITE_OMIT_GENERATED_COLUMNS
SQLITE_PRIVATE void sqlite3ExprCodeGeneratedColumn(Parse*, Column*, int);
#endif
SQLITE_PRIVATE void sqlite3ExprCodeCopy(Parse*, Expr*, int);
SQLITE_PRIVATE void sqlite3ExprCodeFactorable(Parse*, Expr*, int);
SQLITE_PRIVATE int sqlite3ExprCodeAtInit(Parse*, Expr*, int);
SQLITE_PRIVATE int sqlite3ExprCodeTemp(Parse*, Expr*, int*);
SQLITE_PRIVATE int sqlite3ExprCodeTarget(Parse*, Expr*, int);
SQLITE_PRIVATE int sqlite3ExprCodeExprList(Parse*, ExprList*, int, int, u8);
#define SQLITE_ECEL_DUP      0x01  /* Deep, not shallow copies */
#define SQLITE_ECEL_FACTOR   0x02  /* Factor out constant terms */
#define SQLITE_ECEL_REF      0x04  /* Use ExprList.u.x.iOrderByCol */
#define SQLITE_ECEL_OMITREF  0x08  /* Omit if ExprList.u.x.iOrderByCol */
................................................................................
SQLITE_PRIVATE   int sqlite3AuthReadCol(Parse*, const char *, const char *, int);
#else
# define sqlite3AuthRead(a,b,c,d)
# define sqlite3AuthCheck(a,b,c,d,e)    SQLITE_OK
# define sqlite3AuthContextPush(a,b,c)
# define sqlite3AuthContextPop(a)  ((void)(a))
#endif

SQLITE_PRIVATE void sqlite3Attach(Parse*, Expr*, Expr*, Expr*);
SQLITE_PRIVATE void sqlite3Detach(Parse*, Expr*);
SQLITE_PRIVATE void sqlite3FixInit(DbFixer*, Parse*, int, const char*, const Token*);
SQLITE_PRIVATE int sqlite3FixSrcList(DbFixer*, SrcList*);
SQLITE_PRIVATE int sqlite3FixSelect(DbFixer*, Select*);
SQLITE_PRIVATE int sqlite3FixExpr(DbFixer*, Expr*);
SQLITE_PRIVATE int sqlite3FixExprList(DbFixer*, ExprList*);
................................................................................
  sqlite3PutVarint((A),(B)))
#define getVarint    sqlite3GetVarint
#define putVarint    sqlite3PutVarint


SQLITE_PRIVATE const char *sqlite3IndexAffinityStr(sqlite3*, Index*);
SQLITE_PRIVATE void sqlite3TableAffinity(Vdbe*, Table*, int);
SQLITE_PRIVATE char sqlite3CompareAffinity(Expr *pExpr, char aff2);
SQLITE_PRIVATE int sqlite3IndexAffinityOk(Expr *pExpr, char idx_affinity);
SQLITE_PRIVATE char sqlite3TableColumnAffinity(Table*,int);
SQLITE_PRIVATE char sqlite3ExprAffinity(Expr *pExpr);
SQLITE_PRIVATE int sqlite3Atoi64(const char*, i64*, int, u8);
SQLITE_PRIVATE int sqlite3DecOrHexToI64(const char*, i64*);
SQLITE_PRIVATE void sqlite3ErrorWithMsg(sqlite3*, int, const char*,...);
SQLITE_PRIVATE void sqlite3Error(sqlite3*,int);
SQLITE_PRIVATE void sqlite3SystemError(sqlite3*,int);
SQLITE_PRIVATE void *sqlite3HexToBlob(sqlite3*, const char *z, int n);
SQLITE_PRIVATE u8 sqlite3HexToInt(int h);
................................................................................
#endif

SQLITE_PRIVATE const char *sqlite3ErrStr(int);
SQLITE_PRIVATE int sqlite3ReadSchema(Parse *pParse);
SQLITE_PRIVATE CollSeq *sqlite3FindCollSeq(sqlite3*,u8 enc, const char*,int);
SQLITE_PRIVATE int sqlite3IsBinary(const CollSeq*);
SQLITE_PRIVATE CollSeq *sqlite3LocateCollSeq(Parse *pParse, const char*zName);

SQLITE_PRIVATE CollSeq *sqlite3ExprCollSeq(Parse *pParse, Expr *pExpr);
SQLITE_PRIVATE CollSeq *sqlite3ExprNNCollSeq(Parse *pParse, Expr *pExpr);
SQLITE_PRIVATE int sqlite3ExprCollSeqMatch(Parse*,Expr*,Expr*);
SQLITE_PRIVATE Expr *sqlite3ExprAddCollateToken(Parse *pParse, Expr*, const Token*, int);
SQLITE_PRIVATE Expr *sqlite3ExprAddCollateString(Parse*,Expr*,const char*);
SQLITE_PRIVATE Expr *sqlite3ExprSkipCollate(Expr*);
SQLITE_PRIVATE Expr *sqlite3ExprSkipCollateAndLikely(Expr*);
SQLITE_PRIVATE int sqlite3CheckCollSeq(Parse *, CollSeq *);
SQLITE_PRIVATE int sqlite3WritableSchema(sqlite3*);
SQLITE_PRIVATE int sqlite3CheckObjectName(Parse*, const char*,const char*,const char*);
................................................................................
SQLITE_PRIVATE void sqlite3SelectWrongNumTermsError(Parse *pParse, Select *p);
SQLITE_PRIVATE int sqlite3MatchEName(
  const struct ExprList_item*,
  const char*,
  const char*,
  const char*
);

SQLITE_PRIVATE int sqlite3ResolveExprNames(NameContext*, Expr*);
SQLITE_PRIVATE int sqlite3ResolveExprListNames(NameContext*, ExprList*);
SQLITE_PRIVATE void sqlite3ResolveSelectNames(Parse*, Select*, NameContext*);
SQLITE_PRIVATE int sqlite3ResolveSelfReference(Parse*,Table*,int,Expr*,ExprList*);
SQLITE_PRIVATE int sqlite3ResolveOrderGroupBy(Parse*, Select*, ExprList*, const char*);
SQLITE_PRIVATE void sqlite3ColumnDefault(Vdbe *, Table *, int, int);
SQLITE_PRIVATE void sqlite3AlterFinishAddColumn(Parse *, Token *);
................................................................................
SQLITE_PRIVATE int sqlite3TransferBindings(sqlite3_stmt *, sqlite3_stmt *);
SQLITE_PRIVATE void sqlite3ParserReset(Parse*);
#ifdef SQLITE_ENABLE_NORMALIZE
SQLITE_PRIVATE char *sqlite3Normalize(Vdbe*, const char*);
#endif
SQLITE_PRIVATE int sqlite3Reprepare(Vdbe*);
SQLITE_PRIVATE void sqlite3ExprListCheckLength(Parse*, ExprList*, const char*);
SQLITE_PRIVATE CollSeq *sqlite3ExprCompareCollSeq(Parse*,Expr*);
SQLITE_PRIVATE CollSeq *sqlite3BinaryCompareCollSeq(Parse *, Expr *, Expr *);
SQLITE_PRIVATE int sqlite3TempInMemory(const sqlite3*);
SQLITE_PRIVATE const char *sqlite3JournalModename(int);
#ifndef SQLITE_OMIT_WAL
SQLITE_PRIVATE   int sqlite3Checkpoint(sqlite3*, int, int, int*, int*);
SQLITE_PRIVATE   int sqlite3WalDefaultHook(void*,sqlite3*,const char*,int);
#endif
#ifndef SQLITE_OMIT_CTE
................................................................................
  int rcApp;              /* errcode set by sqlite3_result_error_code() */
  u32 nWrite;             /* Number of write operations that have occurred */
#endif
  u16 nResColumn;         /* Number of columns in one row of the result set */
  u8 errorAction;         /* Recovery action to do in case of an error */
  u8 minWriteFileFormat;  /* Minimum file format for writable database files */
  u8 prepFlags;           /* SQLITE_PREPARE_* flags */

  bft expired:2;          /* 1: recompile VM immediately  2: when convenient */
  bft explain:2;          /* True if EXPLAIN present on SQL command */
  bft doingRerun:1;       /* True if rerunning after an auto-reprepare */
  bft changeCntOn:1;      /* True to update the change-counter */
  bft runOnlyOnce:1;      /* Automatically expire on reset */
  bft usesStmtJournal:1;  /* True if uses a statement journal */
  bft readOnly:1;         /* True for statements that do not write */
  bft bIsReader:1;        /* True for statements that read */
  yDbMask btreeMask;      /* Bitmask of db->aDb[] entries referenced */
  yDbMask lockMask;       /* Subset of btreeMask that requires a lock */
................................................................................
    sqlite3_str_appendf(&x, "{%d:*}", pItem->iCursor);
    if( pItem->zDatabase ){
      sqlite3_str_appendf(&x, " %s.%s", pItem->zDatabase, pItem->zName);
    }else if( pItem->zName ){
      sqlite3_str_appendf(&x, " %s", pItem->zName);
    }
    if( pItem->pTab ){
      sqlite3_str_appendf(&x, " tab=%Q nCol=%d ptr=%p",
           pItem->pTab->zName, pItem->pTab->nCol, pItem->pTab);
    }
    if( pItem->zAlias ){
      sqlite3_str_appendf(&x, " (AS %s)", pItem->zAlias);
    }
    if( pItem->fg.jointype & JT_LEFT ){
      sqlite3_str_appendf(&x, " LEFT-JOIN");
    }
................................................................................

/*
** Generate a human-readable explanation of an expression tree.
*/
SQLITE_PRIVATE void sqlite3TreeViewExpr(TreeView *pView, const Expr *pExpr, u8 moreToFollow){
  const char *zBinOp = 0;   /* Binary operator */
  const char *zUniOp = 0;   /* Unary operator */
  char zFlgs[60];
  pView = sqlite3TreeViewPush(pView, moreToFollow);
  if( pExpr==0 ){
    sqlite3TreeViewLine(pView, "nil");
    sqlite3TreeViewPop(pView);
    return;
  }
  if( pExpr->flags || pExpr->affExpr ){
    StrAccum x;
    sqlite3StrAccumInit(&x, 0, zFlgs, sizeof(zFlgs), 0);
    sqlite3_str_appendf(&x, " fg.af=%x.%c",
      pExpr->flags, pExpr->affExpr ? pExpr->affExpr : 'n');
    if( ExprHasProperty(pExpr, EP_FromJoin) ){
      sqlite3_str_appendf(&x, " iRJT=%d", pExpr->iRightJoinTable);
    }
    if( ExprHasProperty(pExpr, EP_FromDDL) ){
      sqlite3_str_appendf(&x, " DDL");



    }
    sqlite3StrAccumFinish(&x);
  }else{
    zFlgs[0] = 0;
  }
  switch( pExpr->op ){
    case TK_AGG_COLUMN: {
................................................................................
    case TK_BITAND:  zBinOp = "BITAND"; break;
    case TK_BITOR:   zBinOp = "BITOR";  break;
    case TK_SLASH:   zBinOp = "DIV";    break;
    case TK_LSHIFT:  zBinOp = "LSHIFT"; break;
    case TK_RSHIFT:  zBinOp = "RSHIFT"; break;
    case TK_CONCAT:  zBinOp = "CONCAT"; break;
    case TK_DOT:     zBinOp = "DOT";    break;


    case TK_UMINUS:  zUniOp = "UMINUS"; break;
    case TK_UPLUS:   zUniOp = "UPLUS";  break;
    case TK_BITNOT:  zUniOp = "BITNOT"; break;
    case TK_NOT:     zUniOp = "NOT";    break;
    case TK_ISNULL:  zUniOp = "ISNULL"; break;
    case TK_NOTNULL: zUniOp = "NOTNULL"; break;
................................................................................
  sqlite3RowSetClear(pArg);
  sqlite3DbFree(((RowSet*)pArg)->db, pArg);
}

/*
** Allocate a new RowSetEntry object that is associated with the
** given RowSet.  Return a pointer to the new and completely uninitialized
** objected.
**
** In an OOM situation, the RowSet.db->mallocFailed flag is set and this
** routine returns NULL.
*/
static struct RowSetEntry *rowSetEntryAlloc(RowSet *p){
  assert( p!=0 );
  if( p->nFresh==0 ){  /*OPTIMIZATION-IF-FALSE*/
................................................................................
  ** To save unnecessary work, only do this when the batch number changes.
  */
  if( iBatch!=pRowSet->iBatch ){  /*OPTIMIZATION-IF-FALSE*/
    p = pRowSet->pEntry;
    if( p ){
      struct RowSetEntry **ppPrevTree = &pRowSet->pForest;
      if( (pRowSet->rsFlags & ROWSET_SORTED)==0 ){ /*OPTIMIZATION-IF-FALSE*/
        /* Only sort the current set of entiries if they need it */
        p = rowSetEntrySort(p);
      }
      for(pTree = pRowSet->pForest; pTree; pTree=pTree->pRight){
        ppPrevTree = &pTree->pRight;
        if( pTree->pLeft==0 ){
          pTree->pLeft = rowSetListToTree(p);
          break;
................................................................................
**
** This function is called when a free-list leaf page is removed from the
** free-list for reuse. It returns false if it is safe to retrieve the
** page from the pager layer with the 'no-content' flag set. True otherwise.
*/
static int btreeGetHasContent(BtShared *pBt, Pgno pgno){
  Bitvec *p = pBt->pHasContent;
  return (p && (pgno>sqlite3BitvecSize(p) || sqlite3BitvecTest(p, pgno)));
}

/*
** Clear (destroy) the BtShared.pHasContent bitvec. This should be
** invoked at the conclusion of each write-transaction.
*/
static void btreeClearHasContent(BtShared *pBt){
................................................................................
  for(i=1, pX=pVdbe->aMem+1; i<pVdbe->nMem; i++, pX++){
    if( pX->pScopyFrom==pMem ){
      u16 mFlags;
      if( pVdbe->db->flags & SQLITE_VdbeTrace ){
        sqlite3DebugPrintf("Invalidate R[%d] due to change in R[%d]\n",
          (int)(pX - pVdbe->aMem), (int)(pMem - pVdbe->aMem));
      }
      /* If pX is marked as a shallow copy of pMem, then verify that
      ** no significant changes have been made to pX since the OP_SCopy.
      ** A significant change would indicated a missed call to this
      ** function for pX.  Minor changes, such as adding or removing a
      ** dual type, are allowed, as long as the underlying value is the
      ** same. */
      mFlags = pMem->flags & pX->flags & pX->mScopyFlags;
      assert( (mFlags&(MEM_Int|MEM_IntReal))==0 || pMem->u.i==pX->u.i );
      /* assert( (mFlags&MEM_Real)==0 || pMem->u.r==pX->u.r ); */
      /*                                          ^^           */
      /*       Cannot reliably compare doubles for equality    */
      assert( (mFlags&MEM_Str)==0  || (pMem->n==pX->n && pMem->z==pX->z) );
      assert( (mFlags&MEM_Blob)==0  || sqlite3BlobCompare(pMem,pX)==0 );
      
      /* pMem is the register that is changing.  But also mark pX as
      ** undefined so that we can quickly detect the shallow-copy error */
      pX->flags = MEM_Undefined;
      pX->pScopyFrom = 0;
    }
  }
................................................................................
SQLITE_PRIVATE void sqlite3ExplainBreakpoint(const char *z1, const char *z2){
  (void)z1;
  (void)z2;
}
#endif

/*
** Add a new OP_ opcode.
**
** If the bPush flag is true, then make this opcode the parent for
** subsequent Explains until sqlite3VdbeExplainPop() is called.
*/
SQLITE_PRIVATE void sqlite3VdbeExplain(Parse *pParse, u8 bPush, const char *zFmt, ...){
#ifndef SQLITE_DEBUG
  /* Always include the OP_Explain opcodes if SQLITE_DEBUG is defined.
................................................................................
#ifdef SQLITE_ENABLE_CURSOR_HINTS
    case P4_EXPR: {
      displayP4Expr(&x, pOp->p4.pExpr);
      break;
    }
#endif
    case P4_COLLSEQ: {

      CollSeq *pColl = pOp->p4.pColl;

      sqlite3_str_appendf(&x, "(%.20s)", pColl->zName);

      break;
    }
    case P4_FUNCDEF: {
      FuncDef *pDef = pOp->p4.pFunc;
      sqlite3_str_appendf(&x, "%s(%d)", pDef->zName, pDef->nArg);
      break;
    }
................................................................................
  if( pParse->explain ){
    static const char * const azColName[] = {
       "addr", "opcode", "p1", "p2", "p3", "p4", "p5", "comment",
       "id", "parent", "notused", "detail"
    };
    int iFirst, mx, i;
    if( nMem<10 ) nMem = 10;

    if( pParse->explain==2 ){
      sqlite3VdbeSetNumCols(p, 4);
      iFirst = 8;
      mx = 12;
    }else{
      sqlite3VdbeSetNumCols(p, 8);
      iFirst = 0;
................................................................................
      p->anExec = allocSpace(&x, p->anExec, p->nOp*sizeof(i64));
#endif
    }
  }

  p->pVList = pParse->pVList;
  pParse->pVList =  0;
  p->explain = pParse->explain;
  if( db->mallocFailed ){
    p->nVar = 0;
    p->nCursor = 0;
    p->nMem = 0;
  }else{
    p->nCursor = nCursor;
    p->nVar = (ynVar)nVar;
................................................................................
  i64 nByte;          /* Total size of the output string or blob */
  u16 flags1;         /* Initial flags for P1 */
  u16 flags2;         /* Initial flags for P2 */

  pIn1 = &aMem[pOp->p1];
  pIn2 = &aMem[pOp->p2];
  pOut = &aMem[pOp->p3];
  testcase( pIn1==pIn2 );
  testcase( pOut==pIn2 );
  assert( pIn1!=pOut );
  flags1 = pIn1->flags;
  testcase( flags1 & MEM_Null );
  testcase( pIn2->flags & MEM_Null );
  if( (flags1 | pIn2->flags) & MEM_Null ){
    sqlite3VdbeMemSetNull(pOut);
................................................................................
** values need not be contiguous but all P1 values should be small integers.
** It is an error for P1 to be negative.
**
** Allowed P5 bits:
** <ul>
** <li>  <b>0x02 OPFLAG_SEEKEQ</b>: This cursor will only be used for
**       equality lookups (implemented as a pair of opcodes OP_SeekGE/OP_IdxGT
**       of OP_SeekLE/OP_IdxGT)
** </ul>
**
** The P4 value may be either an integer (P4_INT32) or a pointer to
** a KeyInfo structure (P4_KEYINFO). If it is a pointer to a KeyInfo 
** object, then table being opened must be an [index b-tree] where the
** KeyInfo object defines the content and collating 
** sequence of that index b-tree. Otherwise, if P4 is an integer 
................................................................................
** be the same as every other ReopenIdx or OpenRead for the same cursor
** number.
**
** Allowed P5 bits:
** <ul>
** <li>  <b>0x02 OPFLAG_SEEKEQ</b>: This cursor will only be used for
**       equality lookups (implemented as a pair of opcodes OP_SeekGE/OP_IdxGT
**       of OP_SeekLE/OP_IdxGT)
** </ul>
**
** See also: OP_OpenRead, OP_OpenWrite
*/
/* Opcode: OpenWrite P1 P2 P3 P4 P5
** Synopsis: root=P2 iDb=P3
**
................................................................................
** value, then the table being opened must be a [table b-tree] with a
** number of columns no less than the value of P4.
**
** Allowed P5 bits:
** <ul>
** <li>  <b>0x02 OPFLAG_SEEKEQ</b>: This cursor will only be used for
**       equality lookups (implemented as a pair of opcodes OP_SeekGE/OP_IdxGT
**       of OP_SeekLE/OP_IdxGT)
** <li>  <b>0x08 OPFLAG_FORDELETE</b>: This cursor is used only to seek
**       and subsequently delete entries in an index btree.  This is a
**       hint to the storage engine that the storage engine is allowed to
**       ignore.  The hint is not used by the official SQLite b*tree storage
**       engine, but is used by COMDB2.
** <li>  <b>0x10 OPFLAG_P2ISREG</b>: Use the content of register P2
**       as the root page, not the value of P2 itself.
................................................................................
  ** since moved into the btree layer.  */  
  pCur->isTable = pOp->p4type!=P4_KEYINFO;

open_cursor_set_hints:
  assert( OPFLAG_BULKCSR==BTREE_BULKLOAD );
  assert( OPFLAG_SEEKEQ==BTREE_SEEK_EQ );
  testcase( pOp->p5 & OPFLAG_BULKCSR );
#ifdef SQLITE_ENABLE_CURSOR_HINTS
  testcase( pOp->p2 & OPFLAG_SEEKEQ );
#endif
  sqlite3BtreeCursorHintFlags(pCur->uc.pCursor,
                               (pOp->p5 & (OPFLAG_BULKCSR|OPFLAG_SEEKEQ)));
  if( rc ) goto abort_due_to_error;
  break;
}

/* Opcode: OpenDup P1 P2 * * *
................................................................................
** that are used as an unpacked index key. 
**
** Reposition cursor P1 so that  it points to the smallest entry that 
** is greater than or equal to the key value. If there are no records 
** greater than or equal to the key and P2 is not zero, then jump to P2.
**
** If the cursor P1 was opened using the OPFLAG_SEEKEQ flag, then this
** opcode will always land on a record that equally equals the key, or
** else jump immediately to P2.  When the cursor is OPFLAG_SEEKEQ, this
** opcode must be followed by an IdxLE opcode with the same arguments.
** The IdxLE opcode will be skipped if this opcode succeeds, but the
** IdxLE opcode will be used on subsequent loop iterations.


**
** This opcode leaves the cursor configured to move in forward order,
** from the beginning toward the end.  In other words, the cursor is
** configured to use Next, not Prev.
**
** See also: Found, NotFound, SeekLt, SeekGt, SeekLe
*/
................................................................................
** Synopsis: key=r[P3@P4]
**
** If cursor P1 refers to an SQL table (B-Tree that uses integer keys), 
** use the value in register P3 as a key. If cursor P1 refers 
** to an SQL index, then P3 is the first in an array of P4 registers 
** that are used as an unpacked index key. 
**
** Reposition cursor P1 so that  it points to the smallest entry that 
** is greater than the key value. If there are no records greater than 
** the key and P2 is not zero, then jump to P2.
**
** This opcode leaves the cursor configured to move in forward order,
** from the beginning toward the end.  In other words, the cursor is
** configured to use Next, not Prev.
**
................................................................................
** less than or equal to the key and P2 is not zero, then jump to P2.
**
** This opcode leaves the cursor configured to move in reverse order,
** from the end toward the beginning.  In other words, the cursor is
** configured to use Prev, not Next.
**
** If the cursor P1 was opened using the OPFLAG_SEEKEQ flag, then this
** opcode will always land on a record that equally equals the key, or
** else jump immediately to P2.  When the cursor is OPFLAG_SEEKEQ, this
** opcode must be followed by an IdxGE opcode with the same arguments.
** The IdxGE opcode will be skipped if this opcode succeeds, but the
** IdxGE opcode will be used on subsequent loop iterations.


**
** See also: Found, NotFound, SeekGt, SeekGe, SeekLt
*/
case OP_SeekLT:         /* jump, in3, group */
case OP_SeekLE:         /* jump, in3, group */
case OP_SeekGE:         /* jump, in3, group */
case OP_SeekGT: {       /* jump, in3, group */
................................................................................
  pC->seekOp = pOp->opcode;
#endif

  pC->deferredMoveto = 0;
  pC->cacheStatus = CACHE_STALE;
  if( pC->isTable ){
    u16 flags3, newType;
    /* The BTREE_SEEK_EQ flag is only set on index cursors */
    assert( sqlite3BtreeCursorHasHint(pC->uc.pCursor, BTREE_SEEK_EQ)==0
              || CORRUPT_DB );

    /* The input value in P3 might be of any type: integer, real, string,
    ** blob, or NULL.  But it needs to be an integer before we can do
    ** the seek, so convert it. */
    pIn3 = &aMem[pOp->p3];
................................................................................
    }
    rc = sqlite3BtreeMovetoUnpacked(pC->uc.pCursor, 0, (u64)iKey, 0, &res);
    pC->movetoTarget = iKey;  /* Used by OP_Delete */
    if( rc!=SQLITE_OK ){
      goto abort_due_to_error;
    }
  }else{
    /* For a cursor with the BTREE_SEEK_EQ hint, only the OP_SeekGE and
    ** OP_SeekLE opcodes are allowed, and these must be immediately followed
    ** by an OP_IdxGT or OP_IdxLT opcode, respectively, with the same key.

    */
    if( sqlite3BtreeCursorHasHint(pC->uc.pCursor, BTREE_SEEK_EQ) ){
      eqOnly = 1;
      assert( pOp->opcode==OP_SeekGE || pOp->opcode==OP_SeekLE );
      assert( pOp[1].opcode==OP_IdxLT || pOp[1].opcode==OP_IdxGT );


      assert( pOp[1].p1==pOp[0].p1 );
      assert( pOp[1].p2==pOp[0].p2 );
      assert( pOp[1].p3==pOp[0].p3 );
      assert( pOp[1].p4.i==pOp[0].p4.i );
    }

    nField = pOp->p4.i;
................................................................................
#ifdef SQLITE_DEBUG
  /* Verify that second and subsequent executions of the same trigger do not
  ** try to reuse register values from the first use. */
  {
    int i;
    for(i=0; i<p->nMem; i++){
      aMem[i].pScopyFrom = 0;  /* Prevent false-positive AboutToChange() errs */
      aMem[i].flags |= MEM_Undefined; /* Cause a fault if this reg is reused */
    }
  }
#endif
  pOp = &aOp[-1];
  goto check_for_interrupt;
}

................................................................................
*/
SQLITE_PRIVATE int sqlite3WalkSelectFrom(Walker *pWalker, Select *p){
  SrcList *pSrc;
  int i;
  struct SrcList_item *pItem;

  pSrc = p->pSrc;
  assert( pSrc!=0 );
  for(i=pSrc->nSrc, pItem=pSrc->a; i>0; i--, pItem++){
    if( pItem->pSelect && sqlite3WalkSelect(pWalker, pItem->pSelect) ){
      return WRC_Abort;
    }
    if( pItem->fg.isTabFunc
     && sqlite3WalkExprList(pWalker, pItem->u1.pFuncArg)
    ){
      return WRC_Abort;

    }
  }
  return WRC_Continue;
} 

/*
** Call sqlite3WalkExpr() for every expression in Select statement p.
................................................................................
    }
    return (db->flags & SQLITE_DqsDDL)!=0;
  }else{
    /* Currently parsing a DML statement */
    return (db->flags & SQLITE_DqsDML)!=0;
  }
}


























/*
** Given the name of a column of the form X.Y.Z or Y.Z or just Z, look up
** that name in the set of source tables in pSrcList and make the pExpr 
** expression node refer back to that source column.  The following changes
** are made to pExpr:
**
................................................................................
    }else{
      for(i=0; i<db->nDb; i++){
        assert( db->aDb[i].zDbSName );
        if( sqlite3StrICmp(db->aDb[i].zDbSName,zDb)==0 ){
          pSchema = db->aDb[i].pSchema;
          break;
        }






      }
    }
  }

  /* Start at the inner-most context and move outward until a match is found */
  assert( pNC && cnt==0 );
  do{
................................................................................
  ** avoid setting bits beyond the maximum column number of the table.
  ** (See ticket [b92e5e8ec2cdbaa1]).
  **
  ** If a generated column is referenced, set bits for every column
  ** of the table.
  */
  if( pExpr->iColumn>=0 && pMatch!=0 ){
    int n = pExpr->iColumn;
    Table *pExTab = pExpr->y.pTab;
    assert( pExTab!=0 );
    assert( pMatch->iCursor==pExpr->iTable );
    if( (pExTab->tabFlags & TF_HasGenerated)!=0
     && (pExTab->aCol[n].colFlags & COLFLAG_GENERATED)!=0 
    ){
      testcase( pExTab->nCol==BMS-1 );
      testcase( pExTab->nCol==BMS );
      pMatch->colUsed = pExTab->nCol>=BMS ? ALLBITS : MASKBIT(pExTab->nCol)-1;
    }else{
      testcase( n==BMS-1 );
      testcase( n==BMS );
      if( n>=BMS ) n = BMS-1;
      pMatch->colUsed |= ((Bitmask)1)<<n;
    }
  }

  /* Clean up and return
  */
  sqlite3ExprDelete(db, pExpr->pLeft);
  pExpr->pLeft = 0;
  sqlite3ExprDelete(db, pExpr->pRight);
................................................................................
** have an affinity:
**
** CREATE TABLE t1(a);
** SELECT * FROM t1 WHERE a;
** SELECT a AS b FROM t1 WHERE b;
** SELECT * FROM t1 WHERE (select a from t1);
*/
SQLITE_PRIVATE char sqlite3ExprAffinity(Expr *pExpr){
  int op;
  while( ExprHasProperty(pExpr, EP_Skip) ){
    assert( pExpr->op==TK_COLLATE );
    pExpr = pExpr->pLeft;
    assert( pExpr!=0 );
  }
  op = pExpr->op;
................................................................................
** default collation if pExpr has no defined collation.
**
** The collating sequence might be determined by a COLLATE operator
** or by the presence of a column with a defined collating sequence.
** COLLATE operators take first precedence.  Left operands take
** precedence over right operands.
*/
SQLITE_PRIVATE CollSeq *sqlite3ExprCollSeq(Parse *pParse, Expr *pExpr){
  sqlite3 *db = pParse->db;
  CollSeq *pColl = 0;
  Expr *p = pExpr;
  while( p ){
    int op = p->op;
    if( op==TK_REGISTER ) op = p->op2;
    if( (op==TK_AGG_COLUMN || op==TK_COLUMN || op==TK_TRIGGER)
     && p->y.pTab!=0
    ){
      /* op==TK_REGISTER && p->y.pTab!=0 happens when pExpr was originally
................................................................................
** defautl collation sequence.
**
** See also: sqlite3ExprCollSeq()
**
** The sqlite3ExprCollSeq() routine works the same except that it
** returns NULL if there is no defined collation.
*/
SQLITE_PRIVATE CollSeq *sqlite3ExprNNCollSeq(Parse *pParse, Expr *pExpr){
  CollSeq *p = sqlite3ExprCollSeq(pParse, pExpr);
  if( p==0 ) p = pParse->db->pDfltColl;
  assert( p!=0 );
  return p;
}

/*
** Return TRUE if the two expressions have equivalent collating sequences.
*/
SQLITE_PRIVATE int sqlite3ExprCollSeqMatch(Parse *pParse, Expr *pE1, Expr *pE2){
  CollSeq *pColl1 = sqlite3ExprNNCollSeq(pParse, pE1);
  CollSeq *pColl2 = sqlite3ExprNNCollSeq(pParse, pE2);
  return sqlite3StrICmp(pColl1->zName, pColl2->zName)==0;
}

/*
** pExpr is an operand of a comparison operator.  aff2 is the
** type affinity of the other operand.  This routine returns the
** type affinity that should be used for the comparison operator.
*/
SQLITE_PRIVATE char sqlite3CompareAffinity(Expr *pExpr, char aff2){
  char aff1 = sqlite3ExprAffinity(pExpr);
  if( aff1>SQLITE_AFF_NONE && aff2>SQLITE_AFF_NONE ){
    /* Both sides of the comparison are columns. If one has numeric
    ** affinity, use that. Otherwise use no affinity.
    */
    if( sqlite3IsNumericAffinity(aff1) || sqlite3IsNumericAffinity(aff2) ){
      return SQLITE_AFF_NUMERIC;
................................................................................
  }
}

/*
** pExpr is a comparison operator.  Return the type affinity that should
** be applied to both operands prior to doing the comparison.
*/
static char comparisonAffinity(Expr *pExpr){
  char aff;
  assert( pExpr->op==TK_EQ || pExpr->op==TK_IN || pExpr->op==TK_LT ||
          pExpr->op==TK_GT || pExpr->op==TK_GE || pExpr->op==TK_LE ||
          pExpr->op==TK_NE || pExpr->op==TK_IS || pExpr->op==TK_ISNOT );
  assert( pExpr->pLeft );
  aff = sqlite3ExprAffinity(pExpr->pLeft);
  if( pExpr->pRight ){
................................................................................

/*
** pExpr is a comparison expression, eg. '=', '<', IN(...) etc.
** idx_affinity is the affinity of an indexed column. Return true
** if the index with affinity idx_affinity may be used to implement
** the comparison in pExpr.
*/
SQLITE_PRIVATE int sqlite3IndexAffinityOk(Expr *pExpr, char idx_affinity){
  char aff = comparisonAffinity(pExpr);
  if( aff<SQLITE_AFF_TEXT ){
    return 1;
  }
  if( aff==SQLITE_AFF_TEXT ){
    return idx_affinity==SQLITE_AFF_TEXT;
  }
................................................................................
  return sqlite3IsNumericAffinity(idx_affinity);
}

/*
** Return the P5 value that should be used for a binary comparison
** opcode (OP_Eq, OP_Ge etc.) used to compare pExpr1 and pExpr2.
*/
static u8 binaryCompareP5(Expr *pExpr1, Expr *pExpr2, int jumpIfNull){




  u8 aff = (char)sqlite3ExprAffinity(pExpr2);
  aff = (u8)sqlite3CompareAffinity(pExpr1, aff) | (u8)jumpIfNull;
  return aff;
}

/*
** Return a pointer to the collation sequence that should be used by
................................................................................
** type.
**
** Argument pRight (but not pLeft) may be a null pointer. In this case,
** it is not considered.
*/
SQLITE_PRIVATE CollSeq *sqlite3BinaryCompareCollSeq(
  Parse *pParse, 
  Expr *pLeft, 
  Expr *pRight
){
  CollSeq *pColl;
  assert( pLeft );
  if( pLeft->flags & EP_Collate ){
    pColl = sqlite3ExprCollSeq(pParse, pLeft);
  }else if( pRight && (pRight->flags & EP_Collate)!=0 ){
    pColl = sqlite3ExprCollSeq(pParse, pRight);
................................................................................
** appropriate for the comparison operator.
**
** This is normally just a wrapper around sqlite3BinaryCompareCollSeq().
** However, if the OP_Commuted flag is set, then the order of the operands
** is reversed in the sqlite3BinaryCompareCollSeq() call so that the
** correct collating sequence is found.
*/
SQLITE_PRIVATE CollSeq *sqlite3ExprCompareCollSeq(Parse *pParse, Expr *p){
  if( ExprHasProperty(p, EP_Commuted) ){
    return sqlite3BinaryCompareCollSeq(pParse, p->pRight, p->pLeft);
  }else{
    return sqlite3BinaryCompareCollSeq(pParse, p->pLeft, p->pRight);
  }
}

................................................................................
  int i;
  int regLeft = 0;
  int regRight = 0;
  u8 opx = op;
  int addrDone = sqlite3VdbeMakeLabel(pParse);
  int isCommuted = ExprHasProperty(pExpr,EP_Commuted);


  if( pParse->nErr ) return;
  if( nLeft!=sqlite3ExprVectorSize(pRight) ){
    sqlite3ErrorMsg(pParse, "row value misused");
    return;
  }
  assert( pExpr->op==TK_EQ || pExpr->op==TK_NE 
       || pExpr->op==TK_IS || pExpr->op==TK_ISNOT 
................................................................................
#endif
  ){
    nSize = EXPR_FULLSIZE;
  }else{
    assert( !ExprHasProperty(p, EP_TokenOnly|EP_Reduced) );
    assert( !ExprHasProperty(p, EP_FromJoin) ); 
    assert( !ExprHasProperty(p, EP_MemToken) );
    assert( !ExprHasProperty(p, EP_NoReduce) );
    if( p->pLeft || p->x.pList ){
      nSize = EXPR_REDUCEDSIZE | EP_Reduced;
    }else{
      assert( p->pRight==0 );
      nSize = EXPR_TOKENONLYSIZE | EP_TokenOnly;
    }
  }
................................................................................
      }
    }

    /* Set the EP_Reduced, EP_TokenOnly, and EP_Static flags appropriately. */
    pNew->flags &= ~(EP_Reduced|EP_TokenOnly|EP_Static|EP_MemToken);
    pNew->flags |= nStructSize & (EP_Reduced|EP_TokenOnly);
    pNew->flags |= staticFlag;





    /* Copy the p->u.zToken string, if any. */
    if( nToken ){
      char *zToken = pNew->u.zToken = (char*)&zAlloc[nNewSize];
      memcpy(zToken, p->u.zToken, nToken);
    }

................................................................................
**   (2) the expression does originate in the ON or USING clause
**       of a LEFT JOIN, and
**   (3) the expression does not contain any EP_FixedCol TK_COLUMN
**       operands created by the constant propagation optimization.
**
** When this routine returns true, it indicates that the expression
** can be added to the pParse->pConstExpr list and evaluated once when
** the prepared statement starts up.  See sqlite3ExprCodeAtInit().
*/
SQLITE_PRIVATE int sqlite3ExprIsConstantNotJoin(Expr *p){
  return exprIsConst(p, 2, 0);
}

/*
** Walk an expression tree.  Return non-zero if the expression is constant
................................................................................
      sqlite3VdbeAddOp2(v, OP_OpenDup, iTab, pExpr->iTable);
      sqlite3VdbeJumpHere(v, addrOnce);
      return;
    }

    /* Begin coding the subroutine */
    ExprSetProperty(pExpr, EP_Subrtn);

    pExpr->y.sub.regReturn = ++pParse->nMem;
    pExpr->y.sub.iAddr =
      sqlite3VdbeAddOp2(v, OP_Integer, 0, pExpr->y.sub.regReturn) + 1;
    VdbeComment((v, "return address"));

    addrOnce = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
  }
................................................................................
  int destStep2;        /* Where to jump when NULLs seen in step 2 */
  int destStep6 = 0;    /* Start of code for Step 6 */
  int addrTruthOp;      /* Address of opcode that determines the IN is true */
  int destNotNull;      /* Jump here if a comparison is not true in step 6 */
  int addrTop;          /* Top of the step-6 loop */ 
  int iTab = 0;         /* Index to use */


  pLeft = pExpr->pLeft;
  if( sqlite3ExprCheckIN(pParse, pExpr) ) return;
  zAff = exprINAffinity(pParse, pExpr);
  nVector = sqlite3ExprVectorSize(pExpr->pLeft);
  aiMap = (int*)sqlite3DbMallocZero(
      pParse->db, nVector*(sizeof(int) + sizeof(char)) + 1
  );
................................................................................
  assert( v!=0 );
  assert( pParse->iSelfTab!=0 );
  if( pParse->iSelfTab>0 ){
    iAddr = sqlite3VdbeAddOp3(v, OP_IfNullRow, pParse->iSelfTab-1, 0, regOut);
  }else{
    iAddr = 0;
  }
  sqlite3ExprCode(pParse, pCol->pDflt, regOut);
  if( pCol->affinity>=SQLITE_AFF_TEXT ){
    sqlite3VdbeAddOp4(v, OP_Affinity, regOut, 1, 0, &pCol->affinity, 1);
  }
  if( iAddr ) sqlite3VdbeJumpHere(v, iAddr);
}
#endif /* SQLITE_OMIT_GENERATED_COLUMNS */

................................................................................
    return 0;
  }

expr_code_doover:
  if( pExpr==0 ){
    op = TK_NULL;
  }else{

    op = pExpr->op;
  }
  switch( op ){
    case TK_AGG_COLUMN: {
      AggInfo *pAggInfo = pExpr->pAggInfo;
      struct AggInfo_col *pCol = &pAggInfo->aCol[pExpr->iAgg];
      if( !pAggInfo->directMode ){
        assert( pCol->iMem>0 );
        return pCol->iMem;
      }else if( pAggInfo->useSortingIdx ){

        sqlite3VdbeAddOp3(v, OP_Column, pAggInfo->sortingIdxPTab,
                              pCol->iSorterColumn, target);








        return target;
      }
      /* Otherwise, fall thru into the TK_COLUMN case */
    }
    case TK_COLUMN: {
      int iTab = pExpr->iTable;
      int iReg;
................................................................................
        codeReal(v, pLeft->u.zToken, 1, target);
        return target;
#endif
      }else{
        tempX.op = TK_INTEGER;
        tempX.flags = EP_IntValue|EP_TokenOnly;
        tempX.u.iValue = 0;

        r1 = sqlite3ExprCodeTemp(pParse, &tempX, &regFree1);
        r2 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree2);
        sqlite3VdbeAddOp3(v, OP_Subtract, r2, r1, target);
        testcase( regFree2==0 );
      }
      break;
    }
................................................................................
#ifndef SQLITE_OMIT_WINDOWFUNC
      if( ExprHasProperty(pExpr, EP_WinFunc) ){
        return pExpr->y.pWin->regResult;
      }
#endif

      if( ConstFactorOk(pParse) && sqlite3ExprIsConstantNotJoin(pExpr) ){
        /* SQL functions can be expensive. So try to move constant functions
        ** out of the inner loop, even if that means an extra OP_Copy. */
        return sqlite3ExprCodeAtInit(pParse, pExpr, -1);
      }
      assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
      if( ExprHasProperty(pExpr, EP_TokenOnly) ){
        pFarg = 0;
      }else{
        pFarg = pExpr->x.pList;
      }
      nFarg = pFarg ? pFarg->nExpr : 0;
      assert( !ExprHasProperty(pExpr, EP_IntValue) );
      zId = pExpr->u.zToken;
      pDef = sqlite3FindFunction(db, zId, nFarg, enc, 0);
#ifdef SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION
      if( pDef==0 && pParse->explain ){
        pDef = sqlite3FindFunction(db, "unknown", nFarg, enc, 0);
................................................................................
  }
  sqlite3ReleaseTempReg(pParse, regFree1);
  sqlite3ReleaseTempReg(pParse, regFree2);
  return inReg;
}

/*
** Factor out the code of the given expression to initialization time.






**
** If regDest>=0 then the result is always stored in that register and the
** result is not reusable.  If regDest<0 then this routine is free to 
** store the value whereever it wants.  The register where the expression 
** is stored is returned.  When regDest<0, two identical expressions will
** code to the same register.


*/
SQLITE_PRIVATE int sqlite3ExprCodeAtInit(
  Parse *pParse,    /* Parsing context */
  Expr *pExpr,      /* The expression to code when the VDBE initializes */
  int regDest       /* Store the value in this register */
){
  ExprList *p;
  assert( ConstFactorOk(pParse) );
  p = pParse->pConstExpr;
................................................................................
    for(pItem=p->a, i=p->nExpr; i>0; pItem++, i--){
      if( pItem->reusable && sqlite3ExprCompare(0,pItem->pExpr,pExpr,-1)==0 ){
        return pItem->u.iConstExprReg;
      }
    }
  }
  pExpr = sqlite3ExprDup(pParse->db, pExpr, 0);














  p = sqlite3ExprListAppend(pParse, p, pExpr);
  if( p ){
     struct ExprList_item *pItem = &p->a[p->nExpr-1];
     pItem->reusable = regDest<0;
     if( regDest<0 ) regDest = ++pParse->nMem;
     pItem->u.iConstExprReg = regDest;
  }
  pParse->pConstExpr = p;

  return regDest;
}

/*
** Generate code to evaluate an expression and store the results
** into a register.  Return the register number where the results
** are stored.
................................................................................
  int r2;
  pExpr = sqlite3ExprSkipCollateAndLikely(pExpr);
  if( ConstFactorOk(pParse)
   && pExpr->op!=TK_REGISTER
   && sqlite3ExprIsConstantNotJoin(pExpr)
  ){
    *pReg  = 0;
    r2 = sqlite3ExprCodeAtInit(pParse, pExpr, -1);
  }else{
    int r1 = sqlite3GetTempReg(pParse);
    r2 = sqlite3ExprCodeTarget(pParse, pExpr, r1);
    if( r2==r1 ){
      *pReg = r1;
    }else{
      sqlite3ReleaseTempReg(pParse, r1);
................................................................................
** Generate code that will evaluate expression pExpr and store the
** results in register target.  The results are guaranteed to appear
** in register target.
*/
SQLITE_PRIVATE void sqlite3ExprCode(Parse *pParse, Expr *pExpr, int target){
  int inReg;


  assert( target>0 && target<=pParse->nMem );
  inReg = sqlite3ExprCodeTarget(pParse, pExpr, target);
  assert( pParse->pVdbe!=0 || pParse->db->mallocFailed );
  if( inReg!=target && pParse->pVdbe ){
    u8 op;
    if( ExprHasProperty(pExpr,EP_Subquery) ){
      op = OP_Copy;
................................................................................
** Generate code that will evaluate expression pExpr and store the
** results in register target.  The results are guaranteed to appear
** in register target.  If the expression is constant, then this routine
** might choose to code the expression at initialization time.
*/
SQLITE_PRIVATE void sqlite3ExprCodeFactorable(Parse *pParse, Expr *pExpr, int target){
  if( pParse->okConstFactor && sqlite3ExprIsConstantNotJoin(pExpr) ){
    sqlite3ExprCodeAtInit(pParse, pExpr, target);
  }else{
    sqlite3ExprCode(pParse, pExpr, target);
  }
}

/*
** Generate code that pushes the value of every element of the given
** expression list into a sequence of registers beginning at target.
**
................................................................................
        n--;
      }else{
        sqlite3VdbeAddOp2(v, copyOp, j+srcReg-1, target+i);
      }
    }else if( (flags & SQLITE_ECEL_FACTOR)!=0
           && sqlite3ExprIsConstantNotJoin(pExpr)
    ){
      sqlite3ExprCodeAtInit(pParse, pExpr, target+i);
    }else{
      int inReg = sqlite3ExprCodeTarget(pParse, pExpr, target+i);
      if( inReg!=target+i ){
        VdbeOp *pOp;
        if( copyOp==OP_Copy
         && (pOp=sqlite3VdbeGetOp(v, -1))->opcode==OP_Copy
         && pOp->p1+pOp->p3+1==inReg
................................................................................
  int regFree1 = 0;
  int regFree2 = 0;
  int r1, r2;

  assert( jumpIfNull==SQLITE_JUMPIFNULL || jumpIfNull==0 );
  if( NEVER(v==0) )     return;  /* Existence of VDBE checked by caller */
  if( NEVER(pExpr==0) ) return;  /* No way this can happen */

  op = pExpr->op;
  switch( op ){
    case TK_AND:
    case TK_OR: {
      Expr *pAlt = sqlite3ExprSimplifiedAndOr(pExpr);
      if( pAlt!=pExpr ){
        sqlite3ExprIfTrue(pParse, pAlt, dest, jumpIfNull);
................................................................................
  int regFree1 = 0;
  int regFree2 = 0;
  int r1, r2;

  assert( jumpIfNull==SQLITE_JUMPIFNULL || jumpIfNull==0 );
  if( NEVER(v==0) ) return; /* Existence of VDBE checked by caller */
  if( pExpr==0 )    return;


  /* The value of pExpr->op and op are related as follows:
  **
  **       pExpr->op            op
  **       ---------          ----------
  **       TK_ISNULL          OP_NotNull
  **       TK_NOTNULL         OP_IsNull
................................................................................
      if( sqlite3_stricmp(pA->u.zToken,pB->u.zToken)!=0 ) return 2;
    }else if( ALWAYS(pB->u.zToken!=0) && strcmp(pA->u.zToken,pB->u.zToken)!=0 ){
      return 2;
    }
  }
  if( (pA->flags & (EP_Distinct|EP_Commuted))
     != (pB->flags & (EP_Distinct|EP_Commuted)) ) return 2;
  if( (combinedFlags & EP_TokenOnly)==0 ){
    if( combinedFlags & EP_xIsSelect ) return 2;
    if( (combinedFlags & EP_FixedCol)==0
     && sqlite3ExprCompare(pParse, pA->pLeft, pB->pLeft, iTab) ) return 2;
    if( sqlite3ExprCompare(pParse, pA->pRight, pB->pRight, iTab) ) return 2;
    if( sqlite3ExprListCompare(pA->x.pList, pB->x.pList, iTab) ) return 2;
    if( pA->op!=TK_STRING
     && pA->op!=TK_TRUEFALSE
     && (combinedFlags & EP_Reduced)==0
    ){
      if( pA->iColumn!=pB->iColumn ) return 2;
      if( pA->op2!=pB->op2 ){
        if( pA->op==TK_TRUTH ) return 2;
        if( pA->op==TK_FUNCTION && iTab<0 ){
          /* Ex: CREATE TABLE t1(a CHECK( a<julianday('now') ));
          **     INSERT INTO t1(a) VALUES(julianday('now')+10);
          ** Without this test, sqlite3ExprCodeAtInit() will run on the
          ** the julianday() of INSERT first, and remember that expression.
          ** Then sqlite3ExprCodeInit() will see the julianday() in the CHECK
          ** constraint as redundant, reusing the one from the INSERT, even
          ** though the julianday() in INSERT lacks the critical NC_IsCheck
          ** flag.  See ticket [830277d9db6c3ba1] (2019-10-30)
          */
          return 2;
        }
      }
      if( pA->op!=TK_IN && pA->iTable!=pB->iTable && pA->iTable!=iTab ){
        return 2;
      }
    }
  }
  return 0;
}
................................................................................
#endif

/*
** Three SQL functions - stat_init(), stat_push(), and stat_get() -
** share an instance of the following structure to hold their state
** information.
*/
typedef struct Stat4Accum Stat4Accum;
typedef struct Stat4Sample Stat4Sample;
struct Stat4Sample {
  tRowcnt *anEq;                  /* sqlite_stat4.nEq */
  tRowcnt *anDLt;                 /* sqlite_stat4.nDLt */
#ifdef SQLITE_ENABLE_STAT4
  tRowcnt *anLt;                  /* sqlite_stat4.nLt */
  union {
    i64 iRowid;                     /* Rowid in main table of the key */
    u8 *aRowid;                     /* Key for WITHOUT ROWID tables */
................................................................................
  } u;
  u32 nRowid;                     /* Sizeof aRowid[] */
  u8 isPSample;                   /* True if a periodic sample */
  int iCol;                       /* If !isPSample, the reason for inclusion */
  u32 iHash;                      /* Tiebreaker hash */
#endif
};                                                    
struct Stat4Accum {

  tRowcnt nRow;             /* Number of rows in the entire table */
  tRowcnt nPSample;         /* How often to do a periodic sample */
  int nCol;                 /* Number of columns in index + pk/rowid */
  int nKeyCol;              /* Number of index columns w/o the pk/rowid */



  int mxSample;             /* Maximum number of samples to accumulate */
  Stat4Sample current;      /* Current row as a Stat4Sample */
  u32 iPrn;                 /* Pseudo-random number used for sampling */
  Stat4Sample *aBest;       /* Array of nCol best samples */
  int iMin;                 /* Index in a[] of entry with minimum score */
  int nSample;              /* Current number of samples */
  int nMaxEqZero;           /* Max leading 0 in anEq[] for any a[] entry */
  int iGet;                 /* Index of current sample accessed by stat_get() */
  Stat4Sample *a;           /* Array of mxSample Stat4Sample objects */
  sqlite3 *db;              /* Database connection, for malloc() */
};

/* Reclaim memory used by a Stat4Sample
*/
#ifdef SQLITE_ENABLE_STAT4
static void sampleClear(sqlite3 *db, Stat4Sample *p){
  assert( db!=0 );
  if( p->nRowid ){
    sqlite3DbFree(db, p->u.aRowid);
    p->nRowid = 0;
  }
}
#endif

/* Initialize the BLOB value of a ROWID
*/
#ifdef SQLITE_ENABLE_STAT4
static void sampleSetRowid(sqlite3 *db, Stat4Sample *p, int n, const u8 *pData){
  assert( db!=0 );
  if( p->nRowid ) sqlite3DbFree(db, p->u.aRowid);
  p->u.aRowid = sqlite3DbMallocRawNN(db, n);
  if( p->u.aRowid ){
    p->nRowid = n;
    memcpy(p->u.aRowid, pData, n);
  }else{
................................................................................
  }
}
#endif

/* Initialize the INTEGER value of a ROWID.
*/
#ifdef SQLITE_ENABLE_STAT4
static void sampleSetRowidInt64(sqlite3 *db, Stat4Sample *p, i64 iRowid){
  assert( db!=0 );
  if( p->nRowid ) sqlite3DbFree(db, p->u.aRowid);
  p->nRowid = 0;
  p->u.iRowid = iRowid;
}
#endif


/*
** Copy the contents of object (*pFrom) into (*pTo).
*/
#ifdef SQLITE_ENABLE_STAT4
static void sampleCopy(Stat4Accum *p, Stat4Sample *pTo, Stat4Sample *pFrom){
  pTo->isPSample = pFrom->isPSample;
  pTo->iCol = pFrom->iCol;
  pTo->iHash = pFrom->iHash;
  memcpy(pTo->anEq, pFrom->anEq, sizeof(tRowcnt)*p->nCol);
  memcpy(pTo->anLt, pFrom->anLt, sizeof(tRowcnt)*p->nCol);
  memcpy(pTo->anDLt, pFrom->anDLt, sizeof(tRowcnt)*p->nCol);
  if( pFrom->nRowid ){
................................................................................
  }else{
    sampleSetRowidInt64(p->db, pTo, pFrom->u.iRowid);
  }
}
#endif

/*
** Reclaim all memory of a Stat4Accum structure.
*/
static void stat4Destructor(void *pOld){
  Stat4Accum *p = (Stat4Accum*)pOld;
#ifdef SQLITE_ENABLE_STAT4
  int i;
  for(i=0; i<p->nCol; i++) sampleClear(p->db, p->aBest+i);
  for(i=0; i<p->mxSample; i++) sampleClear(p->db, p->a+i);
  sampleClear(p->db, &p->current);
#endif
  sqlite3DbFree(p->db, p);
................................................................................
** Note 2:  C is only used for STAT4.
**
** For indexes on ordinary rowid tables, N==K+1.  But for indexes on
** WITHOUT ROWID tables, N=K+P where P is the number of columns in the
** PRIMARY KEY of the table.  The covering index that implements the
** original WITHOUT ROWID table as N==K as a special case.
**
** This routine allocates the Stat4Accum object in heap memory. The return 
** value is a pointer to the Stat4Accum object.  The datatype of the
** return value is BLOB, but it is really just a pointer to the Stat4Accum
** object.
*/
static void statInit(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  Stat4Accum *p;
  int nCol;                       /* Number of columns in index being sampled */
  int nKeyCol;                    /* Number of key columns */
  int nColUp;                     /* nCol rounded up for alignment */
  int n;                          /* Bytes of space to allocate */
  sqlite3 *db;                    /* Database connection */
#ifdef SQLITE_ENABLE_STAT4
  int mxSample = SQLITE_STAT4_SAMPLES;
................................................................................
  nCol = sqlite3_value_int(argv[0]);
  assert( nCol>0 );
  nColUp = sizeof(tRowcnt)<8 ? (nCol+1)&~1 : nCol;
  nKeyCol = sqlite3_value_int(argv[1]);
  assert( nKeyCol<=nCol );
  assert( nKeyCol>0 );

  /* Allocate the space required for the Stat4Accum object */
  n = sizeof(*p) 
    + sizeof(tRowcnt)*nColUp                  /* Stat4Accum.anEq */
    + sizeof(tRowcnt)*nColUp                  /* Stat4Accum.anDLt */
#ifdef SQLITE_ENABLE_STAT4
    + sizeof(tRowcnt)*nColUp                  /* Stat4Accum.anLt */
    + sizeof(Stat4Sample)*(nCol+mxSample)     /* Stat4Accum.aBest[], a[] */
    + sizeof(tRowcnt)*3*nColUp*(nCol+mxSample)
#endif
  ;
  db = sqlite3_context_db_handle(context);
  p = sqlite3DbMallocZero(db, n);
  if( p==0 ){
    sqlite3_result_error_nomem(context);
................................................................................

    p->iGet = -1;
    p->mxSample = mxSample;
    p->nPSample = (tRowcnt)(sqlite3_value_int64(argv[2])/(mxSample/3+1) + 1);
    p->current.anLt = &p->current.anEq[nColUp];
    p->iPrn = 0x689e962d*(u32)nCol ^ 0xd0944565*(u32)sqlite3_value_int(argv[2]);
  
    /* Set up the Stat4Accum.a[] and aBest[] arrays */
    p->a = (struct Stat4Sample*)&p->current.anLt[nColUp];
    p->aBest = &p->a[mxSample];
    pSpace = (u8*)(&p->a[mxSample+nCol]);
    for(i=0; i<(mxSample+nCol); i++){
      p->a[i].anEq = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nColUp);
      p->a[i].anLt = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nColUp);
      p->a[i].anDLt = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nColUp);
    }
................................................................................
  }
#endif

  /* Return a pointer to the allocated object to the caller.  Note that
  ** only the pointer (the 2nd parameter) matters.  The size of the object
  ** (given by the 3rd parameter) is never used and can be any positive
  ** value. */
  sqlite3_result_blob(context, p, sizeof(*p), stat4Destructor);
}
static const FuncDef statInitFuncdef = {
  2+IsStat4,       /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statInit,        /* xSFunc */
................................................................................
** In other words, if we assume that the cardinalities of the selected
** column for pNew and pOld are equal, is pNew to be preferred over pOld.
**
** This function assumes that for each argument sample, the contents of
** the anEq[] array from pSample->anEq[pSample->iCol+1] onwards are valid. 
*/
static int sampleIsBetterPost(
  Stat4Accum *pAccum, 
  Stat4Sample *pNew, 
  Stat4Sample *pOld
){
  int nCol = pAccum->nCol;
  int i;
  assert( pNew->iCol==pOld->iCol );
  for(i=pNew->iCol+1; i<nCol; i++){
    if( pNew->anEq[i]>pOld->anEq[i] ) return 1;
    if( pNew->anEq[i]<pOld->anEq[i] ) return 0;
................................................................................
/*
** Return true if pNew is to be preferred over pOld.
**
** This function assumes that for each argument sample, the contents of
** the anEq[] array from pSample->anEq[pSample->iCol] onwards are valid. 
*/
static int sampleIsBetter(
  Stat4Accum *pAccum, 
  Stat4Sample *pNew, 
  Stat4Sample *pOld
){
  tRowcnt nEqNew = pNew->anEq[pNew->iCol];
  tRowcnt nEqOld = pOld->anEq[pOld->iCol];

  assert( pOld->isPSample==0 && pNew->isPSample==0 );
  assert( IsStat4 || (pNew->iCol==0 && pOld->iCol==0) );

................................................................................
  return 0;
}

/*
** Copy the contents of sample *pNew into the p->a[] array. If necessary,
** remove the least desirable sample from p->a[] to make room.
*/
static void sampleInsert(Stat4Accum *p, Stat4Sample *pNew, int nEqZero){
  Stat4Sample *pSample = 0;
  int i;

  assert( IsStat4 || nEqZero==0 );

  /* Stat4Accum.nMaxEqZero is set to the maximum number of leading 0
  ** values in the anEq[] array of any sample in Stat4Accum.a[]. In
  ** other words, if nMaxEqZero is n, then it is guaranteed that there
  ** are no samples with Stat4Sample.anEq[m]==0 for (m>=n). */
  if( nEqZero>p->nMaxEqZero ){
    p->nMaxEqZero = nEqZero;
  }
  if( pNew->isPSample==0 ){
    Stat4Sample *pUpgrade = 0;
    assert( pNew->anEq[pNew->iCol]>0 );

    /* This sample is being added because the prefix that ends in column 
    ** iCol occurs many times in the table. However, if we have already
    ** added a sample that shares this prefix, there is no need to add
    ** this one. Instead, upgrade the priority of the highest priority
    ** existing sample that shares this prefix.  */
    for(i=p->nSample-1; i>=0; i--){
      Stat4Sample *pOld = &p->a[i];
      if( pOld->anEq[pNew->iCol]==0 ){
        if( pOld->isPSample ) return;
        assert( pOld->iCol>pNew->iCol );
        assert( sampleIsBetter(p, pNew, pOld) );
        if( pUpgrade==0 || sampleIsBetter(p, pOld, pUpgrade) ){
          pUpgrade = pOld;
        }
................................................................................
      pUpgrade->anEq[pUpgrade->iCol] = pNew->anEq[pUpgrade->iCol];
      goto find_new_min;
    }
  }

  /* If necessary, remove sample iMin to make room for the new sample. */
  if( p->nSample>=p->mxSample ){
    Stat4Sample *pMin = &p->a[p->iMin];
    tRowcnt *anEq = pMin->anEq;
    tRowcnt *anLt = pMin->anLt;
    tRowcnt *anDLt = pMin->anDLt;
    sampleClear(p->db, pMin);
    memmove(pMin, &pMin[1], sizeof(p->a[0])*(p->nSample-p->iMin-1));
    pSample = &p->a[p->nSample-1];
    pSample->nRowid = 0;
................................................................................
    }
    assert( iMin>=0 );
    p->iMin = iMin;
  }
}
#endif /* SQLITE_ENABLE_STAT4 */


/*
** Field iChng of the index being scanned has changed. So at this point
** p->current contains a sample that reflects the previous row of the
** index. The value of anEq[iChng] and subsequent anEq[] elements are
** correct at this point.
*/
static void samplePushPrevious(Stat4Accum *p, int iChng){
#ifdef SQLITE_ENABLE_STAT4
  int i;

  /* Check if any samples from the aBest[] array should be pushed
  ** into IndexSample.a[] at this point.  */
  for(i=(p->nCol-2); i>=iChng; i--){
    Stat4Sample *pBest = &p->aBest[i];
    pBest->anEq[i] = p->current.anEq[i];
    if( p->nSample<p->mxSample || sampleIsBetter(p, pBest, &p->a[p->iMin]) ){
      sampleInsert(p, pBest, i);
    }
  }

  /* Check that no sample contains an anEq[] entry with an index of
................................................................................
      int j;
      for(j=iChng; j<p->nCol; j++){
        if( p->a[i].anEq[j]==0 ) p->a[i].anEq[j] = p->current.anEq[j];
      }
    }
    p->nMaxEqZero = iChng;
  }
#endif

#ifndef SQLITE_ENABLE_STAT4
  UNUSED_PARAMETER( p );
  UNUSED_PARAMETER( iChng );
#endif
}

/*
** Implementation of the stat_push SQL function:  stat_push(P,C,R)
** Arguments:
**
**    P     Pointer to the Stat4Accum object created by stat_init()
**    C     Index of left-most column to differ from previous row
**    R     Rowid for the current row.  Might be a key record for
**          WITHOUT ROWID tables.
**
** This SQL function always returns NULL.  It's purpose it to accumulate
** statistical data and/or samples in the Stat4Accum object about the
** index being analyzed.  The stat_get() SQL function will later be used to
** extract relevant information for constructing the sqlite_statN tables.
**
** The R parameter is only used for STAT4
*/
static void statPush(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  int i;

  /* The three function arguments */
  Stat4Accum *p = (Stat4Accum*)sqlite3_value_blob(argv[0]);
  int iChng = sqlite3_value_int(argv[1]);

  UNUSED_PARAMETER( argc );
  UNUSED_PARAMETER( context );
  assert( p->nCol>0 );
  assert( iChng<p->nCol );

  if( p->nRow==0 ){
    /* This is the first call to this function. Do initialization. */
    for(i=0; i<p->nCol; i++) p->current.anEq[i] = 1;
  }else{
    /* Second and subsequent calls get processed here */

    samplePushPrevious(p, iChng);


    /* Update anDLt[], anLt[] and anEq[] to reflect the values that apply
    ** to the current row of the index. */
    for(i=0; i<iChng; i++){
      p->current.anEq[i]++;
    }
    for(i=iChng; i<p->nCol; i++){
................................................................................
#define STAT_GET_NEQ   2          /* "neq" column of stat[34] entry */
#define STAT_GET_NLT   3          /* "nlt" column of stat[34] entry */
#define STAT_GET_NDLT  4          /* "ndlt" column of stat[34] entry */

/*
** Implementation of the stat_get(P,J) SQL function.  This routine is
** used to query statistical information that has been gathered into
** the Stat4Accum object by prior calls to stat_push().  The P parameter
** has type BLOB but it is really just a pointer to the Stat4Accum object.
** The content to returned is determined by the parameter J
** which is one of the STAT_GET_xxxx values defined above.
**
** The stat_get(P,J) function is not available to generic SQL.  It is
** inserted as part of a manually constructed bytecode program.  (See
** the callStatGet() routine below.)  It is guaranteed that the P
** parameter will always be a poiner to a Stat4Accum object, never a
** NULL.
**
** If STAT4 is not enabled, then J is always
** STAT_GET_STAT1 and is hence omitted and this routine becomes
** a one-parameter function, stat_get(P), that always returns the
** stat1 table entry information.
*/
static void statGet(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  Stat4Accum *p = (Stat4Accum*)sqlite3_value_blob(argv[0]);
#ifdef SQLITE_ENABLE_STAT4
  /* STAT4 has a parameter on this routine. */
  int eCall = sqlite3_value_int(argv[1]);
  assert( argc==2 );
  assert( eCall==STAT_GET_STAT1 || eCall==STAT_GET_NEQ 
       || eCall==STAT_GET_ROWID || eCall==STAT_GET_NLT
       || eCall==STAT_GET_NDLT 
................................................................................
    /* Return the value to store in the "stat" column of the sqlite_stat1
    ** table for this index.
    **
    ** The value is a string composed of a list of integers describing 
    ** the index. The first integer in the list is the total number of 
    ** entries in the index. There is one additional integer in the list 
    ** for each indexed column. This additional integer is an estimate of
    ** the number of rows matched by a stabbing query on the index using
    ** a key with the corresponding number of fields. In other words,
    ** if the index is on columns (a,b) and the sqlite_stat1 value is 
    ** "100 10 2", then SQLite estimates that:
    **
    **   * the index contains 100 rows,
    **   * "WHERE a=?" matches 10 rows, and
    **   * "WHERE a=? AND b=?" matches 2 rows.
................................................................................
#ifdef SQLITE_ENABLE_STAT4
  else if( eCall==STAT_GET_ROWID ){
    if( p->iGet<0 ){
      samplePushPrevious(p, 0);
      p->iGet = 0;
    }
    if( p->iGet<p->nSample ){
      Stat4Sample *pS = p->a + p->iGet;
      if( pS->nRowid==0 ){
        sqlite3_result_int64(context, pS->u.iRowid);
      }else{
        sqlite3_result_blob(context, pS->u.aRowid, pS->nRowid,
                            SQLITE_TRANSIENT);
      }
    }
................................................................................
  int iTabCur;                 /* Table cursor */
  Vdbe *v;                     /* The virtual machine being built up */
  int i;                       /* Loop counter */
  int jZeroRows = -1;          /* Jump from here if number of rows is zero */
  int iDb;                     /* Index of database containing pTab */
  u8 needTableCnt = 1;         /* True to count the table */
  int regNewRowid = iMem++;    /* Rowid for the inserted record */
  int regStat4 = iMem++;       /* Register to hold Stat4Accum object */
  int regChng = iMem++;        /* Index of changed index field */
#ifdef SQLITE_ENABLE_STAT4
  int regRowid = iMem++;       /* Rowid argument passed to stat_push() */
#endif
  int regTemp = iMem++;        /* Temporary use register */
  int regTabname = iMem++;     /* Register containing table name */
  int regIdxname = iMem++;     /* Register containing index name */
................................................................................
      rc = sqlite3ResolveExprNames(pName, pExpr);
    }else{
      pExpr->op = TK_STRING;
    }
  }
  return rc;
}












/*
** An SQL user-function registered to do the work of an ATTACH statement. The
** three arguments to the function come directly from an attach statement:
**
**     ATTACH DATABASE x AS y KEY z
**
................................................................................
    if( db->nDb>=db->aLimit[SQLITE_LIMIT_ATTACHED]+2 ){
      zErrDyn = sqlite3MPrintf(db, "too many attached databases - max %d", 
        db->aLimit[SQLITE_LIMIT_ATTACHED]
      );
      goto attach_error;
    }
    for(i=0; i<db->nDb; i++){
      char *z = db->aDb[i].zDbSName;
      assert( z && zName );
      if( sqlite3StrICmp(z, zName)==0 ){
        zErrDyn = sqlite3MPrintf(db, "database %s is already in use", zName);
        goto attach_error;
      }
    }
  
    /* Allocate the new entry in the db->aDb[] array and initialize the schema
    ** hash tables.
................................................................................

  UNUSED_PARAMETER(NotUsed);

  if( zName==0 ) zName = "";
  for(i=0; i<db->nDb; i++){
    pDb = &db->aDb[i];
    if( pDb->pBt==0 ) continue;
    if( sqlite3StrICmp(pDb->zDbSName, zName)==0 ) break;
  }

  if( i>=db->nDb ){
    sqlite3_snprintf(sizeof(zErr),zErr, "no such database: %s", zName);
    goto detach_error;
  }
  if( i<2 ){
................................................................................
** checks out, these routines return 0.
*/
SQLITE_PRIVATE int sqlite3FixSrcList(
  DbFixer *pFix,       /* Context of the fixation */
  SrcList *pList       /* The Source list to check and modify */
){
  int i;
  const char *zDb;
  struct SrcList_item *pItem;



  if( NEVER(pList==0) ) return 0;
  zDb = pFix->zDb;

  for(i=0, pItem=pList->a; i<pList->nSrc; i++, pItem++){
    if( pFix->bTemp==0 ){
      if( pItem->zDatabase && sqlite3StrICmp(pItem->zDatabase, zDb) ){

        sqlite3ErrorMsg(pFix->pParse,
            "%s %T cannot reference objects in database %s",
            pFix->zType, pFix->pName, pItem->zDatabase);
        return 1;
      }
      sqlite3DbFree(pFix->pParse->db, pItem->zDatabase);
      pItem->zDatabase = 0;
      pItem->pSchema = pFix->pSchema;
      pItem->fg.fromDDL = 1;
    }
#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_TRIGGER)
    if( sqlite3FixSelect(pFix, pItem->pSelect) ) return 1;
    if( sqlite3FixExpr(pFix, pItem->pOn) ) return 1;
................................................................................
  if( db->auth.authLevel<UAUTH_Admin && sqlite3UserAuthTable(zName)!=0 ){
    return 0;
  }
#endif
  while(1){
    for(i=OMIT_TEMPDB; i<db->nDb; i++){
      int j = (i<2) ? i^1 : i;   /* Search TEMP before MAIN */
      if( zDatabase==0 || sqlite3StrICmp(zDatabase, db->aDb[j].zDbSName)==0 ){
        assert( sqlite3SchemaMutexHeld(db, j, 0) );
        p = sqlite3HashFind(&db->aDb[j].pSchema->tblHash, zName);
        if( p ) return p;
      }
    }
    /* Not found.  If the name we were looking for was temp.sqlite_master
    ** then change the name to sqlite_temp_master and try again. */
................................................................................
  int i;
  /* All mutexes are required for schema access.  Make sure we hold them. */
  assert( zDb!=0 || sqlite3BtreeHoldsAllMutexes(db) );
  for(i=OMIT_TEMPDB; i<db->nDb; i++){
    int j = (i<2) ? i^1 : i;  /* Search TEMP before MAIN */
    Schema *pSchema = db->aDb[j].pSchema;
    assert( pSchema );
    if( zDb && sqlite3StrICmp(zDb, db->aDb[j].zDbSName) ) continue;
    assert( sqlite3SchemaMutexHeld(db, j, 0) );
    p = sqlite3HashFind(&pSchema->idxHash, zName);
    if( p ) break;
  }
  return p;
}

................................................................................
  pMod = (Module*)sqlite3HashFind(&db->aModule, pTab->azModuleArg[0]);
  if( pMod==0 ) return 0;
  if( pMod->pModule->iVersion<3 ) return 0;
  if( pMod->pModule->xShadowName==0 ) return 0;
  return pMod->pModule->xShadowName(zTail+1);
}
#endif /* ifndef SQLITE_OMIT_VIRTUALTABLE */



























/*
** This routine is called to report the final ")" that terminates
** a CREATE TABLE statement.
**
** The table structure that other action routines have been building
** is added to the internal hash tables, assuming no errors have
................................................................................
  if( p->pCheck ){
    sqlite3ResolveSelfReference(pParse, p, NC_IsCheck, 0, p->pCheck);
    if( pParse->nErr ){
      /* If errors are seen, delete the CHECK constraints now, else they might
      ** actually be used if PRAGMA writable_schema=ON is set. */
      sqlite3ExprListDelete(db, p->pCheck);
      p->pCheck = 0;


    }
  }
#endif /* !defined(SQLITE_OMIT_CHECK) */
#ifndef SQLITE_OMIT_GENERATED_COLUMNS
  if( p->tabFlags & TF_HasGenerated ){
    int ii, nNG = 0;
    testcase( p->tabFlags & TF_HasVirtual );
................................................................................
SQLITE_PRIVATE CollSeq *sqlite3FindCollSeq(
  sqlite3 *db,          /* Database connection to search */
  u8 enc,               /* Desired text encoding */
  const char *zName,    /* Name of the collating sequence.  Might be NULL */
  int create            /* True to create CollSeq if doesn't already exist */
){
  CollSeq *pColl;


  if( zName ){
    pColl = findCollSeqEntry(db, zName, create);

  }else{
    pColl = db->pDfltColl;
  }
  assert( SQLITE_UTF8==1 && SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 );
  assert( enc>=SQLITE_UTF8 && enc<=SQLITE_UTF16BE );
  if( pColl ) pColl += enc-1;
  return pColl;
}














/*
** This function is responsible for invoking the collation factory callback
** or substituting a collation sequence of a different encoding when the
** requested collation sequence is not available in the desired encoding.
** 
** If it is not NULL, then pColl must point to the database native encoding 
................................................................................
  sqlite3_value **argv
){
  const unsigned char *zA, *zB;
  u32 escape;
  int nPat;
  sqlite3 *db = sqlite3_context_db_handle(context);
  struct compareInfo *pInfo = sqlite3_user_data(context);


#ifdef SQLITE_LIKE_DOESNT_MATCH_BLOBS
  if( sqlite3_value_type(argv[0])==SQLITE_BLOB
   || sqlite3_value_type(argv[1])==SQLITE_BLOB
  ){
#ifdef SQLITE_TEST
    sqlite3_like_count++;
................................................................................
    if( zEsc==0 ) return;
    if( sqlite3Utf8CharLen((char*)zEsc, -1)!=1 ){
      sqlite3_result_error(context, 
          "ESCAPE expression must be a single character", -1);
      return;
    }
    escape = sqlite3Utf8Read(&zEsc);






  }else{
    escape = pInfo->matchSet;
  }
  zB = sqlite3_value_text(argv[0]);
  zA = sqlite3_value_text(argv[1]);
  if( zA && zB ){
#ifdef SQLITE_TEST
................................................................................
  pDef = sqlite3FindFunction(db, pExpr->u.zToken, nExpr, SQLITE_UTF8, 0);
#ifdef SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION
  if( pDef==0 ) return 0;
#endif
  if( NEVER(pDef==0) || (pDef->funcFlags & SQLITE_FUNC_LIKE)==0 ){
    return 0;
  }
  if( nExpr<3 ){
    aWc[3] = 0;
  }else{
    Expr *pEscape = pExpr->x.pList->a[2].pExpr;
    char *zEscape;
    if( pEscape->op!=TK_STRING ) return 0;
    zEscape = pEscape->u.zToken;
    if( zEscape[0]==0 || zEscape[1]!=0 ) return 0;
    aWc[3] = zEscape[0];
  }

  /* The memcpy() statement assumes that the wildcard characters are
  ** the first three statements in the compareInfo structure.  The
  ** asserts() that follow verify that assumption
  */
  memcpy(aWc, pDef->pUserData, 3);
  assert( (char*)&likeInfoAlt == (char*)&likeInfoAlt.matchAll );
  assert( &((char*)&likeInfoAlt)[1] == (char*)&likeInfoAlt.matchOne );
  assert( &((char*)&likeInfoAlt)[2] == (char*)&likeInfoAlt.matchSet );














  *pIsNocase = (pDef->funcFlags & SQLITE_FUNC_CASE)==0;
  return 1;
}

/*
** All of the FuncDef structures in the aBuiltinFunc[] array above
** to the global function hash table.  This occurs at start-time (as
................................................................................
        iReg = sqlite3TableColumnToStorage(pTab, i) + regNewData + 1;
        switch( onError ){
          case OE_Replace: {
            int addr1 = sqlite3VdbeAddOp1(v, OP_NotNull, iReg);
            VdbeCoverage(v);
            assert( (pCol->colFlags & COLFLAG_GENERATED)==0 );
            nSeenReplace++;
            sqlite3ExprCode(pParse, pCol->pDflt, iReg);
            sqlite3VdbeJumpHere(v, addr1);
            break;
          }
          case OE_Abort:
            sqlite3MayAbort(pParse);
            /* Fall through */
          case OE_Rollback:
................................................................................
#ifndef SQLITE_OMIT_CHECK
  if( pTab->pCheck && (db->flags & SQLITE_IgnoreChecks)==0 ){
    ExprList *pCheck = pTab->pCheck;
    pParse->iSelfTab = -(regNewData+1);
    onError = overrideError!=OE_Default ? overrideError : OE_Abort;
    for(i=0; i<pCheck->nExpr; i++){
      int allOk;

      Expr *pExpr = pCheck->a[i].pExpr;
      if( aiChng
       && !sqlite3ExprReferencesUpdatedColumn(pExpr, aiChng, pkChng)
      ){
        /* The check constraints do not reference any of the columns being
        ** updated so there is no point it verifying the check constraint */
        continue;
................................................................................
      }
      if( bAffinityDone==0 ){
        sqlite3TableAffinity(v, pTab, regNewData+1);
        bAffinityDone = 1;
      }
      allOk = sqlite3VdbeMakeLabel(pParse);
      sqlite3VdbeVerifyAbortable(v, onError);


      sqlite3ExprIfTrue(pParse, pExpr, allOk, SQLITE_JUMPIFNULL);


      if( onError==OE_Ignore ){
        sqlite3VdbeGoto(v, ignoreDest);
      }else{
        char *zName = pCheck->a[i].zEName;
        if( zName==0 ) zName = pTab->zName;
        if( onError==OE_Replace ) onError = OE_Abort; /* IMP: R-26383-51744 */
        sqlite3HaltConstraint(pParse, SQLITE_CONSTRAINT_CHECK,
................................................................................
      returnSingleText(v, encnames[ENC(pParse->db)].zName);
    }else{                        /* "PRAGMA encoding = XXX" */
      /* Only change the value of sqlite.enc if the database handle is not
      ** initialized. If the main database exists, the new sqlite.enc value
      ** will be overwritten when the schema is next loaded. If it does not
      ** already exists, it will be created to use the new encoding value.
      */
      int canChangeEnc = 1;  /* True if allowed to change the encoding */
      int i;                 /* For looping over all attached databases */
      for(i=0; i<db->nDb; i++){
        if( db->aDb[i].pBt!=0
         && DbHasProperty(db,i,DB_SchemaLoaded)
         && !DbHasProperty(db,i,DB_Empty)
        ){
          canChangeEnc = 0;
        }
      }
      if( canChangeEnc ){
        for(pEnc=&encnames[0]; pEnc->zName; pEnc++){
          if( 0==sqlite3StrICmp(zRight, pEnc->zName) ){
            SCHEMA_ENC(db) = ENC(db) =
                pEnc->enc ? pEnc->enc : SQLITE_UTF16NATIVE;


            break;
          }
        }
        if( !pEnc->zName ){
          sqlite3ErrorMsg(pParse, "unsupported encoding: %s", zRight);
        }
      }
................................................................................
  InitData *pData = (InitData*)pInit;
  sqlite3 *db = pData->db;
  int iDb = pData->iDb;

  assert( argc==5 );
  UNUSED_PARAMETER2(NotUsed, argc);
  assert( sqlite3_mutex_held(db->mutex) );
  DbClearProperty(db, iDb, DB_Empty);
  pData->nInitRow++;
  if( db->mallocFailed ){
    corruptSchema(pData, argv[1], 0);
    return 1;
  }

  assert( iDb>=0 && iDb<db->nDb );
................................................................................
#endif
  Db *pDb;
  char const *azArg[6];
  int meta[5];
  InitData initData;
  const char *zMasterName;
  int openedTransaction = 0;


  assert( (db->mDbFlags & DBFLAG_SchemaKnownOk)==0 );
  assert( iDb>=0 && iDb<db->nDb );
  assert( db->aDb[iDb].pSchema );
  assert( sqlite3_mutex_held(db->mutex) );
  assert( iDb==1 || sqlite3BtreeHoldsMutex(db->aDb[iDb].pBt) );

................................................................................
  initData.db = db;
  initData.iDb = iDb;
  initData.rc = SQLITE_OK;
  initData.pzErrMsg = pzErrMsg;
  initData.mInitFlags = mFlags;
  initData.nInitRow = 0;
  sqlite3InitCallback(&initData, 5, (char **)azArg, 0);

  if( initData.rc ){
    rc = initData.rc;
    goto error_out;
  }

  /* Create a cursor to hold the database open
  */
................................................................................

  /* If opening a non-empty database, check the text encoding. For the
  ** main database, set sqlite3.enc to the encoding of the main database.
  ** For an attached db, it is an error if the encoding is not the same
  ** as sqlite3.enc.
  */
  if( meta[BTREE_TEXT_ENCODING-1] ){  /* text encoding */
    if( iDb==0 ){
#ifndef SQLITE_OMIT_UTF16
      u8 encoding;

      /* If opening the main database, set ENC(db). */
      encoding = (u8)meta[BTREE_TEXT_ENCODING-1] & 3;
      if( encoding==0 ) encoding = SQLITE_UTF8;
      ENC(db) = encoding;
#else
      ENC(db) = SQLITE_UTF8;
#endif

    }else{
      /* If opening an attached database, the encoding much match ENC(db) */
      if( meta[BTREE_TEXT_ENCODING-1]!=ENC(db) ){
        sqlite3SetString(pzErrMsg, db, "attached databases must use the same"
            " text encoding as main database");
        rc = SQLITE_ERROR;
        goto initone_error_out;
      }
    }
  }else{
    DbSetProperty(db, iDb, DB_Empty);
  }
  pDb->pSchema->enc = ENC(db);

  if( pDb->pSchema->cache_size==0 ){
#ifndef SQLITE_OMIT_DEPRECATED
    size = sqlite3AbsInt32(meta[BTREE_DEFAULT_CACHE_SIZE-1]);
    if( size==0 ){ size = SQLITE_DEFAULT_CACHE_SIZE; }
................................................................................
/*
** Initialize all database files - the main database file, the file
** used to store temporary tables, and any additional database files
** created using ATTACH statements.  Return a success code.  If an
** error occurs, write an error message into *pzErrMsg.
**
** After a database is initialized, the DB_SchemaLoaded bit is set
** bit is set in the flags field of the Db structure. If the database
** file was of zero-length, then the DB_Empty flag is also set.
*/
SQLITE_PRIVATE int sqlite3Init(sqlite3 *db, char **pzErrMsg){
  int i, rc;
  int commit_internal = !(db->mDbFlags&DBFLAG_SchemaChange);
  
  assert( sqlite3_mutex_held(db->mutex) );
  assert( sqlite3BtreeHoldsMutex(db->aDb[0].pBt) );
................................................................................
    sqlite3ExprDelete(db, p->pHaving);
    sqlite3ExprListDelete(db, p->pOrderBy);
    sqlite3ExprDelete(db, p->pLimit);
#ifndef SQLITE_OMIT_WINDOWFUNC
    if( OK_IF_ALWAYS_TRUE(p->pWinDefn) ){
      sqlite3WindowListDelete(db, p->pWinDefn);
    }
    assert( p->pWin==0 );
#endif
    if( OK_IF_ALWAYS_TRUE(p->pWith) ) sqlite3WithDelete(db, p->pWith);
    if( bFree ) sqlite3DbFreeNN(db, p);
    p = pPrior;
    bFree = 1;
  }
}
................................................................................
        substExprList(pSubst, pItem->u1.pFuncArg);
      }
    }
  }while( doPrior && (p = p->pPrior)!=0 );
}
#endif /* !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW) */

































#if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)
/*
** This routine attempts to flatten subqueries as a performance optimization.
** This routine returns 1 if it makes changes and 0 if no flattening occurs.
**
** To understand the concept of flattening, consider the following
** query:
................................................................................
    ** One is tempted to try to add a and b to combine the limits.  But this
    ** does not work if either limit is negative.
    */
    if( pSub->pLimit ){
      pParent->pLimit = pSub->pLimit;
      pSub->pLimit = 0;
    }






  }

  /* Finially, delete what is left of the subquery and return
  ** success.
  */
  sqlite3SelectDelete(db, pSub1);

................................................................................

  assert( pName->nSrc==1 );
  zDb = pName->a[0].zDatabase;
  zName = pName->a[0].zName;
  assert( zDb!=0 || sqlite3BtreeHoldsAllMutexes(db) );
  for(i=OMIT_TEMPDB; i<db->nDb; i++){
    int j = (i<2) ? i^1 : i;  /* Search TEMP before MAIN */
    if( zDb && sqlite3StrICmp(db->aDb[j].zDbSName, zDb) ) continue;
    assert( sqlite3SchemaMutexHeld(db, j, 0) );
    pTrigger = sqlite3HashFind(&(db->aDb[j].pSchema->trigHash), zName);
    if( pTrigger ) break;
  }
  if( !pTrigger ){
    if( !noErr ){
      sqlite3ErrorMsg(pParse, "no such trigger: %S", pName, 0);
................................................................................
    ){
      assert( bSeekPastNull==0 && nExtraReg==0 && nBtm==0 && nTop==0 );
      assert( pRangeEnd==0 && pRangeStart==0 );
      testcase( pLoop->nSkip>0 );
      nExtraReg = 1;
      bSeekPastNull = 1;
      pLevel->regBignull = regBignull = ++pParse->nMem;



      pLevel->addrBignull = sqlite3VdbeMakeLabel(pParse);
    }

    /* If we are doing a reverse order scan on an ascending index, or
    ** a forward order scan on a descending index, interchange the 
    ** start and end terms (pRangeStart and pRangeEnd).
    */
................................................................................
        sqlite3VdbeSetP4KeyInfo(pParse, pIx);
        if( (pLoop->wsFlags & WHERE_CONSTRAINT)!=0
         && (pLoop->wsFlags & (WHERE_COLUMN_RANGE|WHERE_SKIPSCAN))==0
         && (pLoop->wsFlags & WHERE_BIGNULL_SORT)==0
         && (pWInfo->wctrlFlags&WHERE_ORDERBY_MIN)==0
         && pWInfo->eDistinct!=WHERE_DISTINCT_ORDERED
        ){
          sqlite3VdbeChangeP5(v, OPFLAG_SEEKEQ); /* Hint to COMDB2 */
        }
        VdbeComment((v, "%s", pIx->zName));
#ifdef SQLITE_ENABLE_COLUMN_USED_MASK
        {
          u64 colUsed = 0;
          int ii, jj;
          for(ii=0; ii<pIx->nColumn; ii++){
................................................................................
      int j;
      sqlite3VdbeResolveLabel(v, pLevel->addrNxt);
      for(j=pLevel->u.in.nIn, pIn=&pLevel->u.in.aInLoop[j-1]; j>0; j--, pIn--){
        sqlite3VdbeJumpHere(v, pIn->addrInTop+1);
        if( pIn->eEndLoopOp!=OP_Noop ){
          if( pIn->nPrefix ){
            assert( pLoop->wsFlags & WHERE_IN_EARLYOUT );
            if( (pLoop->wsFlags & WHERE_VIRTUALTABLE)==0 ){
              sqlite3VdbeAddOp4Int(v, OP_IfNoHope, pLevel->iIdxCur,
                  sqlite3VdbeCurrentAddr(v)+2+(pLevel->iLeftJoin!=0),
                  pIn->iBase, pIn->nPrefix);
              VdbeCoverage(v);
            }
            if( pLevel->iLeftJoin ){
              /* For LEFT JOIN queries, cursor pIn->iCur may not have been
              ** opened yet. This occurs for WHERE clauses such as
              ** "a = ? AND b IN (...)", where the index is on (a, b). If
              ** the RHS of the (a=?) is NULL, then the "b IN (...)" may
              ** never have been coded, but the body of the loop run to
              ** return the null-row. So, if the cursor is not open yet,
              ** jump over the OP_Next or OP_Prev instruction about to
              ** be coded.  */
              sqlite3VdbeAddOp2(v, OP_IfNotOpen, pIn->iCur, 
                  sqlite3VdbeCurrentAddr(v) + 2

              );
              VdbeCoverage(v);






            }
          }
          sqlite3VdbeAddOp2(v, pIn->eEndLoopOp, pIn->iCur, pIn->addrInTop);
          VdbeCoverage(v);
          VdbeCoverageIf(v, pIn->eEndLoopOp==OP_Prev);
          VdbeCoverageIf(v, pIn->eEndLoopOp==OP_Next);
        }
................................................................................
    Expr *pHaving = p->pHaving;
    ExprList *pSort = 0;

    ExprList *pSublist = 0;       /* Expression list for sub-query */
    Window *pMWin = p->pWin;      /* Master window object */
    Window *pWin;                 /* Window object iterator */
    Table *pTab;


    pTab = sqlite3DbMallocZero(db, sizeof(Table));
    if( pTab==0 ){
      return sqlite3ErrorToParser(db, SQLITE_NOMEM);
    }

    p->pSrc = 0;
................................................................................
    p->pSrc = sqlite3SrcListAppend(pParse, 0, 0, 0);
    if( p->pSrc ){
      Table *pTab2;
      p->pSrc->a[0].pSelect = pSub;
      sqlite3SrcListAssignCursors(pParse, p->pSrc);
      pSub->selFlags |= SF_Expanded;
      pTab2 = sqlite3ResultSetOfSelect(pParse, pSub, SQLITE_AFF_NONE);

      if( pTab2==0 ){
        /* Might actually be some other kind of error, but in that case
        ** pParse->nErr will be set, so if SQLITE_NOMEM is set, we will get
        ** the correct error message regardless. */
        rc = SQLITE_NOMEM;
      }else{
        memcpy(pTab, pTab2, sizeof(Table));
................................................................................
static int windowInitAccum(Parse *pParse, Window *pMWin){
  Vdbe *v = sqlite3GetVdbe(pParse);
  int regArg;
  int nArg = 0;
  Window *pWin;
  for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
    FuncDef *pFunc = pWin->pFunc;

    sqlite3VdbeAddOp2(v, OP_Null, 0, pWin->regAccum);
    nArg = MAX(nArg, windowArgCount(pWin));
    if( pMWin->regStartRowid==0 ){
      if( pFunc->zName==nth_valueName || pFunc->zName==first_valueName ){
        sqlite3VdbeAddOp2(v, OP_Integer, 0, pWin->regApp);
        sqlite3VdbeAddOp2(v, OP_Integer, 0, pWin->regApp+1);
      }
................................................................................
      pNew->pPartition = sqlite3ExprListDup(db, p->pPartition, 0);
      pNew->pOrderBy = sqlite3ExprListDup(db, p->pOrderBy, 0);
      pNew->eFrmType = p->eFrmType;
      pNew->eEnd = p->eEnd;
      pNew->eStart = p->eStart;
      pNew->eExclude = p->eExclude;
      pNew->regResult = p->regResult;




      pNew->pStart = sqlite3ExprDup(db, p->pStart, 0);
      pNew->pEnd = sqlite3ExprDup(db, p->pEnd, 0);
      pNew->pOwner = pOwner;
      pNew->bImplicitFrame = p->bImplicitFrame;
    }
  }
  return pNew;
................................................................................
  static Expr *tokenExpr(Parse *pParse, int op, Token t){
    Expr *p = sqlite3DbMallocRawNN(pParse->db, sizeof(Expr)+t.n+1);
    if( p ){
      /* memset(p, 0, sizeof(Expr)); */
      p->op = (u8)op;
      p->affExpr = 0;
      p->flags = EP_Leaf;

      p->iAgg = -1;
      p->pLeft = p->pRight = 0;
      p->x.pList = 0;
      p->pAggInfo = 0;
      p->y.pTab = 0;
      p->op2 = 0;
      p->iTable = 0;
................................................................................
  createCollation(db, sqlite3StrBINARY, SQLITE_UTF16BE, 0, binCollFunc, 0);
  createCollation(db, sqlite3StrBINARY, SQLITE_UTF16LE, 0, binCollFunc, 0);
  createCollation(db, "NOCASE", SQLITE_UTF8, 0, nocaseCollatingFunc, 0);
  createCollation(db, "RTRIM", SQLITE_UTF8, 0, rtrimCollFunc, 0);
  if( db->mallocFailed ){
    goto opendb_out;
  }
  /* EVIDENCE-OF: R-08308-17224 The default collating function for all
  ** strings is BINARY. 
  */
  db->pDfltColl = sqlite3FindCollSeq(db, SQLITE_UTF8, sqlite3StrBINARY, 0);
  assert( db->pDfltColl!=0 );

  /* Parse the filename/URI argument
  **
  ** Only allow sensible combinations of bits in the flags argument.  
  ** Throw an error if any non-sense combination is used.  If we
  ** do not block illegal combinations here, it could trigger
  ** assert() statements in deeper layers.  Sensible combinations
................................................................................
      rc = SQLITE_NOMEM_BKPT;
    }
    sqlite3Error(db, rc);
    goto opendb_out;
  }
  sqlite3BtreeEnter(db->aDb[0].pBt);
  db->aDb[0].pSchema = sqlite3SchemaGet(db, db->aDb[0].pBt);
  if( !db->mallocFailed ) ENC(db) = SCHEMA_ENC(db);


  sqlite3BtreeLeave(db->aDb[0].pBt);
  db->aDb[1].pSchema = sqlite3SchemaGet(db, 0);

  /* The default safety_level for the main database is FULL; for the temp
  ** database it is OFF. This matches the pager layer defaults.  
  */
  db->aDb[0].zDbSName = "main";
................................................................................
  int rc = SQLITE_OK;             /* Return code */
  const char *zCsr = zNode;       /* Cursor to iterate through node */
  const char *zEnd = &zCsr[nNode];/* End of interior node buffer */
  char *zBuffer = 0;              /* Buffer to load terms into */
  i64 nAlloc = 0;                 /* Size of allocated buffer */
  int isFirstTerm = 1;            /* True when processing first term on page */
  sqlite3_int64 iChild;           /* Block id of child node to descend to */


  /* Skip over the 'height' varint that occurs at the start of every 
  ** interior node. Then load the blockid of the left-child of the b-tree
  ** node into variable iChild.  
  **
  ** Even if the data structure on disk is corrupted, this (reading two
  ** varints from the buffer) does not risk an overread. If zNode is a
................................................................................
    return FTS_CORRUPT_VTAB;
  }
  
  while( zCsr<zEnd && (piFirst || piLast) ){
    int cmp;                      /* memcmp() result */
    int nSuffix;                  /* Size of term suffix */
    int nPrefix = 0;              /* Size of term prefix */
    int nBuffer;                  /* Total term size */
  
    /* Load the next term on the node into zBuffer. Use realloc() to expand
    ** the size of zBuffer if required.  */
    if( !isFirstTerm ){
      zCsr += fts3GetVarint32(zCsr, &nPrefix);




    }
    isFirstTerm = 0;
    zCsr += fts3GetVarint32(zCsr, &nSuffix);
    
    assert( nPrefix>=0 && nSuffix>=0 );
    if( nPrefix>zCsr-zNode || nSuffix>zEnd-zCsr || nSuffix==0 ){
      rc = FTS_CORRUPT_VTAB;
................................................................................
      }
    }

    /* If nSeg is less that zero, then there is no level with at least
    ** nMin segments and no hint in the %_stat table. No work to do.
    ** Exit early in this case.  */
    if( nSeg<=0 ) break;







    /* Open a cursor to iterate through the contents of the oldest nSeg 
    ** indexes of absolute level iAbsLevel. If this cursor is opened using 
    ** the 'hint' parameters, it is possible that there are less than nSeg
    ** segments available in level iAbsLevel. In this case, no work is
    ** done on iAbsLevel - fall through to the next iteration of the loop 
    ** to start work on some other level.  */
................................................................................
    const char *zArg = argv[ii];
    if( zArg[0]=='+' ){
      pRtree->nAux++;
      sqlite3_str_appendf(pSql, ",%.*s", rtreeTokenLength(zArg+1), zArg+1);
    }else if( pRtree->nAux>0 ){
      break;
    }else{

      pRtree->nDim2++;

      sqlite3_str_appendf(pSql, ",%.*s NUM", rtreeTokenLength(zArg), zArg);
    }
  }
  sqlite3_str_appendf(pSql, ");");
  zSql = sqlite3_str_finish(pSql);
  if( !zSql ){
    rc = SQLITE_NOMEM;
  }else if( ii<argc ){
................................................................................
    /* There are now 4 possibilities:
    **
    **     1. uPattern is an unescaped match-all character "%",
    **     2. uPattern is an unescaped match-one character "_",
    **     3. uPattern is an unescaped escape character, or
    **     4. uPattern is to be handled as an ordinary character
    */
    if( !prevEscape && uPattern==MATCH_ALL ){
      /* Case 1. */
      uint8_t c;

      /* Skip any MATCH_ALL or MATCH_ONE characters that follow a
      ** MATCH_ALL. For each MATCH_ONE, skip one character in the 
      ** test string.
      */
................................................................................
        if( icuLikeCompare(zPattern, zString, uEsc) ){
          return 1;
        }
        SQLITE_ICU_SKIP_UTF8(zString);
      }
      return 0;

    }else if( !prevEscape && uPattern==MATCH_ONE ){
      /* Case 2. */
      if( *zString==0 ) return 0;
      SQLITE_ICU_SKIP_UTF8(zString);

    }else if( !prevEscape && uPattern==(uint32_t)uEsc){
      /* Case 3. */
      prevEscape = 1;

    }else{
      /* Case 4. */
      uint32_t uString;
      SQLITE_ICU_READ_UTF8(zString, uString);
................................................................................
        break;
      }
    }
  }
  i = 0;
  if( iSchema>=0 ){
    pIdxInfo->aConstraintUsage[iSchema].argvIndex = ++i;

    pIdxInfo->idxNum |= 0x01;
  }
  if( iName>=0 ){
    pIdxInfo->aConstraintUsage[iName].argvIndex = ++i;
    pIdxInfo->idxNum |= 0x02;
  }
  if( iAgg>=0 ){
................................................................................
        if( nLocal<0 ) goto statPageIsCorrupt;
        pCell->nLocal = nLocal;
        assert( nPayload>=(u32)nLocal );
        assert( nLocal<=(nUsable-35) );
        if( nPayload>(u32)nLocal ){
          int j;
          int nOvfl = ((nPayload - nLocal) + nUsable-4 - 1) / (nUsable - 4);

          if( iOff+nLocal>nUsable ) goto statPageIsCorrupt;

          pCell->nLastOvfl = (nPayload-nLocal) - (nOvfl-1) * (nUsable-4);
          pCell->nOvfl = nOvfl;
          pCell->aOvfl = sqlite3_malloc64(sizeof(u32)*nOvfl);
          if( pCell->aOvfl==0 ) return SQLITE_NOMEM_BKPT;
          pCell->aOvfl[0] = sqlite3Get4byte(&aData[iOff+nLocal]);
          for(j=1; j<nOvfl; j++){
            int rc;
................................................................................
){
  int i;
  const char *zSep = "";
  int rc = SQLITE_OK;
  SessionBuffer buf = {0, 0, 0};
  int nPk = 0;

  sessionAppendStr(&buf, "DELETE FROM ", &rc);
  sessionAppendIdent(&buf, zTab, &rc);
  sessionAppendStr(&buf, " WHERE ", &rc);

  for(i=0; i<p->nCol; i++){
    if( p->abPK[i] ){
      nPk++;
      sessionAppendStr(&buf, zSep, &rc);
................................................................................
){
  int rc = SQLITE_OK;
  int i;
  const char *zSep = "";
  SessionBuffer buf = {0, 0, 0};

  /* Append "UPDATE tbl SET " */
  sessionAppendStr(&buf, "UPDATE ", &rc);
  sessionAppendIdent(&buf, zTab, &rc);
  sessionAppendStr(&buf, " SET ", &rc);

  /* Append the assignments */
  for(i=0; i<p->nCol; i++){
    sessionAppendStr(&buf, zSep, &rc);
    sessionAppendIdent(&buf, p->azCol[i], &rc);
................................................................................
static void fts5SourceIdFunc(
  sqlite3_context *pCtx,          /* Function call context */
  int nArg,                       /* Number of args */
  sqlite3_value **apUnused        /* Function arguments */
){
  assert( nArg==0 );
  UNUSED_PARAM2(nArg, apUnused);
  sqlite3_result_text(pCtx, "fts5: 2020-02-27 11:32:14 bfb09371d452d5d4dacab2ec476880bc729952f44ac0e5de90ea7ba203243c8c", -1, SQLITE_TRANSIENT);
}

/*
** Return true if zName is the extension on one of the shadow tables used
** by this module.
*/
static int fts5ShadowName(const char *zName){
................................................................................
#endif
  return rc;
}
#endif /* SQLITE_CORE */
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_STMTVTAB) */

/************** End of stmt.c ************************************************/
#if __LINE__!=228325
#undef SQLITE_SOURCE_ID
#define SQLITE_SOURCE_ID      "2020-02-27 16:21:39 951b39ca74c9bd933139e099d5555283278db475f410f202c162e5d1e6aealt2"
#endif
/* Return the source-id for this library */
SQLITE_API const char *sqlite3_sourceid(void){ return SQLITE_SOURCE_ID; }
/************************** End of sqlite3.c ******************************/







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1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
.....
16537
16538
16539
16540
16541
16542
16543

16544
16545
16546
16547
16548
16549
16550
.....
16694
16695
16696
16697
16698
16699
16700
16701
16702
16703
16704
16705
16706
16707
16708
.....
16903
16904
16905
16906
16907
16908
16909
16910
16911
16912
16913
16914
16915
16916
16917
.....
17867
17868
17869
17870
17871
17872
17873
17874
17875
17876
17877
17878
17879
17880
17881
17882
17883
.....
17944
17945
17946
17947
17948
17949
17950
17951
17952
17953
17954
17955
17956
17957
17958
17959
17960
17961
17962
17963
17964
17965
17966
17967
17968
17969
17970
17971
17972
.....
17977
17978
17979
17980
17981
17982
17983
17984
17985
17986
17987
17988
17989
17990
17991
17992
17993
17994
17995
17996
17997
17998
17999
18000
18001
18002
18003
18004
18005
18006
18007
18008
.....
18968
18969
18970
18971
18972
18973
18974
18975
18976
18977
18978
18979
18980
18981
18982
.....
19513
19514
19515
19516
19517
19518
19519
19520
19521
19522
19523
19524
19525
19526
19527
.....
19668
19669
19670
19671
19672
19673
19674
19675
19676
19677
19678
19679
19680
19681
19682
.....
19728
19729
19730
19731
19732
19733
19734
19735
19736
19737
19738
19739
19740
19741
19742
19743
19744
19745
.....
19754
19755
19756
19757
19758
19759
19760
19761
19762
19763
19764
19765
19766
19767
19768
19769
19770
19771
.....
19824
19825
19826
19827
19828
19829
19830
19831
19832
19833
19834
19835
19836
19837
19838
.....
19989
19990
19991
19992
19993
19994
19995
19996
19997
19998
19999
20000
20001
20002
20003
20004
.....
20963
20964
20965
20966
20967
20968
20969
20970
20971
20972

20973
20974
20975
20976
20977
20978
20979
.....
29406
29407
29408
29409
29410
29411
29412
29413
29414
29415
29416
29417
29418
29419
29420
29421
.....
29666
29667
29668
29669
29670
29671
29672
29673
29674
29675
29676
29677
29678
29679
29680
29681
29682
29683
29684
29685
29686
29687
29688
29689
29690
29691
29692
29693
29694
29695
29696
29697
29698
29699
.....
29793
29794
29795
29796
29797
29798
29799
29800
29801
29802
29803
29804
29805
29806
29807
.....
50915
50916
50917
50918
50919
50920
50921
50922
50923
50924
50925
50926
50927
50928
50929
.....
51191
51192
51193
51194
51195
51196
51197
51198
51199
51200
51201
51202
51203
51204
51205
.....
64556
64557
64558
64559
64560
64561
64562
64563
64564
64565
64566
64567
64568
64569
64570
.....
76200
76201
76202
76203
76204
76205
76206
76207
76208
76209
76210
76211
76212
76213
76214





76215
76216
76217
76218
76219
76220
76221
.....
77562
77563
77564
77565
77566
77567
77568
77569
77570
77571
77572
77573
77574
77575
77576
.....
78796
78797
78798
78799
78800
78801
78802
78803
78804
78805
78806
78807
78808
78809
78810
78811
78812
78813
78814
.....
79513
79514
79515
79516
79517
79518
79519
79520
79521
79522
79523
79524
79525
79526
79527
.....
79564
79565
79566
79567
79568
79569
79570

79571
79572
79573
79574
79575
79576
79577
.....
86248
86249
86250
86251
86252
86253
86254

86255
86256
86257
86258
86259
86260
86261
.....
88368
88369
88370
88371
88372
88373
88374
88375
88376
88377
88378
88379
88380
88381
88382
.....
88398
88399
88400
88401
88402
88403
88404
88405
88406
88407
88408
88409
88410
88411
88412
.....
88422
88423
88424
88425
88426
88427
88428
88429
88430
88431
88432
88433
88434
88435
88436
.....
88534
88535
88536
88537
88538
88539
88540

88541

88542
88543
88544
88545
88546
88547
88548
.....
88790
88791
88792
88793
88794
88795
88796
88797
88798
88799
88800
88801
88802
88803
88804
88805
88806
88807
88808
88809
88810
.....
88812
88813
88814
88815
88816
88817
88818
88819
88820
88821
88822
88823
88824
88825
88826
.....
88857
88858
88859
88860
88861
88862
88863
88864
88865
88866
88867
88868
88869
88870
88871
88872
88873
88874
88875
88876
88877
.....
88900
88901
88902
88903
88904
88905
88906
88907
88908
88909
88910
88911
88912
88913
88914
.....
88959
88960
88961
88962
88963
88964
88965
88966
88967
88968
88969
88970
88971
88972
88973
88974
88975
88976
88977
88978
88979
88980
88981
88982
88983
.....
91184
91185
91186
91187
91188
91189
91190
91191
91192
91193
91194
91195
91196
91197
91198
.....
96577
96578
96579
96580
96581
96582
96583
96584
96585
96586
96587
96588
96589
96590
96591
96592
96593
96594
96595
96596
96597
96598
96599
96600
.....
96807
96808
96809
96810
96811
96812
96813
96814
96815
96816
96817
96818
96819
96820
96821
96822
96823
96824
96825
96826
96827
96828
96829
96830
96831
96832
96833
96834
96835
96836
96837
96838
96839
96840
96841
96842
96843
96844
96845
.....
96909
96910
96911
96912
96913
96914
96915
96916
96917
96918
96919
96920
96921
96922
96923
96924
96925
96926
96927
96928
.....
97235
97236
97237
97238
97239
97240
97241














97242

97243
97244
97245
97246
97247
97248
97249
.....
98596
98597
98598
98599
98600
98601
98602
98603
98604
98605
98606
98607
98608
98609
98610
.....
98706
98707
98708
98709
98710
98711
98712
98713
98714
98715
98716
98717
98718
98719
98720
98721
98722
98723
.....
98778
98779
98780
98781
98782
98783
98784
98785
98786
98787
98788
98789
98790
98791
98792
98793
98794
98795
98796
98797
98798
98799
98800
98801
98802
98803
98804
98805
98806
98807
98808
98809
98810
98811
98812
98813
.....
98821
98822
98823
98824
98825
98826
98827
98828
98829
98830
98831
98832
98833
98834
98835
.....
98844
98845
98846
98847
98848
98849
98850
98851
98852
98853
98854
98855
98856
98857
98858
.....
98859
98860
98861
98862
98863
98864
98865
98866
98867
98868
98869
98870
98871
98872
98873
98874
98875
98876
98877
.....
98883
98884
98885
98886
98887
98888
98889
98890
98891
98892
98893
98894
98895
98896
98897
98898
.....
98909
98910
98911
98912
98913
98914
98915
98916
98917
98918
98919
98920
98921
98922
98923
.....
99152
99153
99154
99155
99156
99157
99158
99159
99160
99161
99162
99163
99164
99165
99166
.....
99765
99766
99767
99768
99769
99770
99771
99772
99773
99774
99775
99776
99777
99778
99779
.....
99870
99871
99872
99873
99874
99875
99876
99877
99878
99879
99880
99881
99882
99883
99884
99885
99886
99887
......
100650
100651
100652
100653
100654
100655
100656
100657
100658
100659
100660
100661
100662
100663
100664
......
101413
101414
101415
101416
101417
101418
101419
101420
101421
101422
101423
101424
101425
101426
101427
......
101734
101735
101736
101737
101738
101739
101740
101741
101742
101743
101744
101745
101746
101747
101748
......
102061
102062
102063
102064
102065
102066
102067
102068
102069
102070
102071
102072
102073
102074
102075
......
102345
102346
102347
102348
102349
102350
102351
102352
102353
102354
102355
102356
102357
102358
102359
102360
102361
102362
102363
102364
102365
102366
102367
102368
102369
102370
102371
102372
102373
102374
102375
102376
102377
102378
102379
102380
......
102609
102610
102611
102612
102613
102614
102615
102616
102617
102618
102619
102620
102621
102622
102623
......
102681
102682
102683
102684
102685
102686
102687
102688
102689
102690
102691
102692
102693


102694

102695
102696
102697
102698
102699
102700
102701
......
103061
103062
103063
103064
103065
103066
103067
103068
103069
103070
103071
103072
103073
103074
103075
103076
103077
103078
103079
103080
103081
103082
103083
103084
103085
103086
103087
103088
103089
103090
103091
......
103095
103096
103097
103098
103099
103100
103101
103102
103103
103104
103105
103106
103107
103108
103109
103110
103111
103112
103113
103114
103115
103116
103117
103118
103119
103120
103121
103122
103123
103124
103125
103126
103127
103128
103129
103130
103131
......
103142
103143
103144
103145
103146
103147
103148
103149
103150
103151
103152
103153
103154
103155
103156
......
103164
103165
103166
103167
103168
103169
103170
103171
103172
103173
103174
103175
103176
103177
103178
......
103199
103200
103201
103202
103203
103204
103205
103206
103207
103208
103209
103210
103211
103212
103213
103214
103215
......
103259
103260
103261
103262
103263
103264
103265
103266
103267
103268
103269
103270
103271
103272
103273
......
103382
103383
103384
103385
103386
103387
103388
103389
103390
103391
103392
103393
103394
103395
103396
......
103524
103525
103526
103527
103528
103529
103530
103531
103532
103533
103534
103535
103536
103537
103538
......
103808
103809
103810
103811
103812
103813
103814
103815
103816
103817
103818
103819
103820
103821
103822
103823
103824
103825
103826














103827
103828
103829
103830
103831
103832
103833
......
106512
106513
106514
106515
106516
106517
106518
106519
106520
106521
106522
106523
106524
106525
106526
106527
106528
......
106529
106530
106531
106532
106533
106534
106535
106536
106537
106538

106539
106540
106541
106542
106543
106544

106545
106546
106547
106548
106549
106550
106551
106552
106553
106554
106555
106556
106557
106558
106559
106560
106561
106562
106563
106564
106565
106566
106567
106568
106569
106570
106571
106572
106573
106574
106575
106576
106577
......
106579
106580
106581
106582
106583
106584
106585
106586
106587
106588
106589
106590
106591
106592
106593
106594
106595
106596
106597
106598
106599
106600
106601
106602
106603
106604
106605
106606
......
106608
106609
106610
106611
106612
106613
106614
106615
106616
106617
106618
106619
106620
106621
106622
106623
106624
106625
......
106639
106640
106641
106642
106643
106644
106645
106646
106647
106648
106649
106650
106651
106652
106653
106654
106655
106656
106657
106658
106659
106660
106661
106662
106663
......
106668
106669
106670
106671
106672
106673
106674
106675
106676
106677
106678
106679
106680
106681
106682
106683
106684
106685
106686
106687
106688
......
106703
106704
106705
106706
106707
106708
106709
106710
106711
106712
106713
106714
106715
106716
106717
106718
......
106724
106725
106726
106727
106728
106729
106730
106731
106732
106733
106734
106735
106736
106737
106738
......
106751
106752
106753
106754
106755
106756
106757
106758
106759
106760
106761
106762
106763
106764
106765
106766
106767
......
106775
106776
106777
106778
106779
106780
106781
106782
106783
106784
106785
106786
106787
106788
106789
106790
106791
......
106797
106798
106799
106800
106801
106802
106803
106804
106805
106806
106807
106808
106809
106810
106811
106812
106813
106814
106815
106816
106817
106818
106819
106820
106821
106822
106823
106824
106825
106826
106827
106828
106829
106830
106831
106832
106833
106834
......
106839
106840
106841
106842
106843
106844
106845
106846
106847
106848
106849
106850
106851
106852
106853
......
106882
106883
106884
106885
106886
106887
106888
106889
106890
106891
106892
106893
106894
106895
106896

106897
106898
106899
106900
106901
106902
106903
106904
106905
106906
106907
106908
106909
......
106919
106920
106921
106922
106923
106924
106925

106926
106927




106928
106929
106930
106931
106932
106933
106934
106935
106936
106937
106938
106939
106940
106941
106942
106943
106944
106945
106946
106947
106948
106949
106950
106951
106952
106953
106954
106955
106956
106957
106958
106959
106960
106961
106962
106963
106964
106965
106966
106967
106968
106969
106970
106971
106972
106973
106974
106975
......
107030
107031
107032
107033
107034
107035
107036
107037
107038
107039
107040
107041
107042
107043
107044
107045
107046
107047
107048
107049
107050
107051
107052
107053
107054
107055
107056
107057
107058
107059
107060
107061
107062
107063
107064
107065
......
107072
107073
107074
107075
107076
107077
107078
107079
107080
107081
107082
107083
107084
107085
107086
......
107115
107116
107117
107118
107119
107120
107121
107122
107123
107124
107125
107126
107127
107128
107129
......
107206
107207
107208
107209
107210
107211
107212
107213
107214
107215
107216
107217
107218
107219
107220
......
108174
108175
108176
108177
108178
108179
108180
108181
108182
108183
108184
108185
108186
108187
108188
108189
108190
108191
108192
108193
108194
108195
108196
108197
108198
......
108258
108259
108260
108261
108262
108263
108264
108265
108266

108267
108268
108269
108270
108271
108272
108273
......
108412
108413
108414
108415
108416
108417
108418
108419
108420
108421
108422
108423
108424
108425
108426
......
108603
108604
108605
108606
108607
108608
108609

108610
108611
108612
108613
108614

108615
108616
108617

108618
108619
108620
108621
108622
108623
108624
108625
108626
108627
108628
108629
108630
108631
......
109342
109343
109344
109345
109346
109347
109348
109349
109350
109351
109352
109353
109354
109355
109356
......
109464
109465
109466
109467
109468
109469
109470
109471
109472
109473
109474
109475
109476
109477
109478
......
111183
111184
111185
111186
111187
111188
111189
111190
111191
111192
111193
111194
111195
111196
111197
111198
111199
111200
111201
111202
111203
111204
111205
111206
111207
111208
111209
111210
111211
111212
111213
111214
111215
111216
111217
111218
111219
111220
111221
111222
......
111302
111303
111304
111305
111306
111307
111308
111309
111310
111311
111312
111313
111314
111315
111316
111317
......
114245
114246
114247
114248
114249
114250
114251
114252
114253
114254
114255
114256
114257
114258
114259



114260
114261
114262
114263
114264
114265
114266
114267
114268
114269
114270
114271
114272
114273
114274
114275
114276
114277
114278
114279
114280
114281
......
116442
116443
116444
116445
116446
116447
116448
116449
116450
116451
116452
116453
116454
116455
116456
......
116478
116479
116480
116481
116482
116483
116484
116485
116486
116487
116488
116489
116490
116491
116492
116493
116494
116495
116496
116497
......
117466
117467
117468
117469
117470
117471
117472










117473
117474
117475
117476
117477
117478
117479
117480
117481
117482
117483
117484
117485
117486
117487
117488
117489
117490
117491
117492
117493
117494
117495
117496
117497
117498
117499
117500
117501
117502
......
120696
120697
120698
120699
120700
120701
120702
120703
120704
120705
120706
120707
120708
120709
120710
......
120751
120752
120753
120754
120755
120756
120757
120758
120759
120760
120761
120762
120763
120764
120765
......
120766
120767
120768
120769
120770
120771
120772
120773
120774
120775
120776
120777
120778
120779
120780
120781
120782
120783
120784
......
126089
126090
126091
126092
126093
126094
126095
126096










126097
126098

126099
126100
126101
126102
126103
126104
126105
126106
126107
126108
......
126903
126904
126905
126906
126907
126908
126909
126910
126911
126912
126913
126914
126915
126916
126917
......
126991
126992
126993
126994
126995
126996
126997
126998
126999
127000
127001
127002
127003
127004
127005
......
127020
127021
127022
127023
127024
127025
127026
127027
127028
127029
127030
127031
127032
127033
127034
......
127080
127081
127082
127083
127084
127085
127086
127087

127088
127089
127090
127091
127092

127093
127094
127095
127096
127097
127098
127099
127100
127101
127102
127103
127104
127105


127106
127107
127108
127109
127110
127111
127112
......
127210
127211
127212
127213
127214
127215
127216
127217

127218
127219
127220
127221
127222
127223
127224
......
127846
127847
127848
127849
127850
127851
127852

127853
127854
127855
127856
127857
127858
127859
......
131323
131324
131325
131326
131327
131328
131329
131330
131331
131332
131333
131334
131335
131336
131337
131338
131339
131340
131341
131342
131343
131344
131345
131346
131347
131348
131349
131350
131351
131352
131353
131354
131355
131356
131357
131358
131359
131360
131361
131362
131363
131364
131365
131366
131367
131368
......
131893
131894
131895
131896
131897
131898
131899
131900
131901
131902
131903
131904
131905
131906
131907
131908
131909
131910
131911
131912
......
135348
135349
135350
135351
135352
135353
135354
135355
135356
135357
135358
135359
135360
135361
135362
......
141370
141371
141372
141373
141374
141375
141376
141377
141378
141379
141380
141381
141382
141383
141384
141385
141386
......
148926
148927
148928
148929
148930
148931
148932
148933
148934
148935
148936
148937
148938
148939
148940
......
149084
149085
149086
149087
149088
149089
149090






149091
149092
149093
149094
149095
149096
149097
149098
149099
149100
149101
149102
149103
149104
149105
149106
149107
149108
149109
149110
149111
149112
149113
149114
149115
149116
149117
......
150221
150222
150223
150224
150225
150226
150227
150228
150229
150230
150231
150232
150233
150234
150235
......
150311
150312
150313
150314
150315
150316
150317
150318
150319
150320
150321
150322
150323
150324
150325
......
151200
151201
151202
151203
151204
151205
151206
151207
151208
151209
151210
151211
151212
151213
151214
......
151579
151580
151581
151582
151583
151584
151585
151586
151587
151588
151589
151590
151591
151592
151593
151594
151595
151596
......
152420
152421
152422
152423
152424
152425
152426
152427
152428
152429
152430
152431
152432
152433
152434
......
162260
162261
162262
162263
162264
162265
162266





162267
162268
162269
162270
162271
162272
162273
......
162304
162305
162306
162307
162308
162309
162310
162311
162312
162313
162314
162315
162316
162317
162318
162319
162320
......
166837
166838
166839
166840
166841
166842
166843
166844
166845
166846
166847
166848
166849
166850
166851
......
166862
166863
166864
166865
166866
166867
166868

166869
166870
166871
166872
166873
166874
166875
166876
166877
166878
166879
166880
166881
166882
166883
166884
......
180093
180094
180095
180096
180097
180098
180099
180100
180101
180102
180103
180104
180105
180106
180107
180108
180109
180110
180111
180112
......
189835
189836
189837
189838
189839
189840
189841
189842
189843
189844
189845
189846
189847
189848
189849
189850
189851
189852
......
192574
192575
192576
192577
192578
192579
192580
192581
192582
192583
192584
192585
192586
192587
192588
......
192600
192601
192602
192603
192604
192605
192606
192607
192608
192609
192610
192611
192612
192613
192614
192615
192616
192617
192618
192619
......
199407
199408
199409
199410
199411
199412
199413
199414
199415
199416
199417
199418
199419
199420
199421
......
199622
199623
199624
199625
199626
199627
199628
199629
199630
199631
199632
199633
199634
199635
199636
199637
199638
......
203957
203958
203959
203960
203961
203962
203963
203964
203965
203966
203967
203968
203969
203970
203971
......
204040
204041
204042
204043
204044
204045
204046
204047
204048
204049
204050
204051
204052
204053
204054
......
223726
223727
223728
223729
223730
223731
223732
223733
223734
223735
223736
223737
223738
223739
223740
......
228508
228509
228510
228511
228512
228513
228514
228515
228516
228517
228518
228519
228520
228521
**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.32.0"
#define SQLITE_VERSION_NUMBER 3032000
#define SQLITE_SOURCE_ID      "2020-03-21 23:10:38 5d14a1c4f2fc17de98ad685ad1422cdfda89dfccb00afcaf32ee416b6f84f525"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
................................................................................
**
** DB_UnresetViews means that one or more views have column names that
** have been filled out.  If the schema changes, these column names might
** changes and so the view will need to be reset.
*/
#define DB_SchemaLoaded    0x0001  /* The schema has been loaded */
#define DB_UnresetViews    0x0002  /* Some views have defined column names */

#define DB_ResetWanted     0x0008  /* Reset the schema when nSchemaLock==0 */

/*
** The number of different kinds of things that can be limited
** using the sqlite3_limit() interface.
*/
#define SQLITE_N_LIMIT (SQLITE_LIMIT_WORKER_THREADS+1)
................................................................................

/*
** Each database connection is an instance of the following structure.
*/
struct sqlite3 {
  sqlite3_vfs *pVfs;            /* OS Interface */
  struct Vdbe *pVdbe;           /* List of active virtual machines */
  CollSeq *pDfltColl;           /* BINARY collseq for the database encoding */
  sqlite3_mutex *mutex;         /* Connection mutex */
  Db *aDb;                      /* All backends */
  int nDb;                      /* Number of backends currently in use */
  u32 mDbFlags;                 /* flags recording internal state */
  u64 flags;                    /* flags settable by pragmas. See below */
  i64 lastRowid;                /* ROWID of most recent insert (see above) */
  i64 szMmap;                   /* Default mmap_size setting */
................................................................................
*/
#define DBFLAG_SchemaChange   0x0001  /* Uncommitted Hash table changes */
#define DBFLAG_PreferBuiltin  0x0002  /* Preference to built-in funcs */
#define DBFLAG_Vacuum         0x0004  /* Currently in a VACUUM */
#define DBFLAG_VacuumInto     0x0008  /* Currently running VACUUM INTO */
#define DBFLAG_SchemaKnownOk  0x0010  /* Schema is known to be valid */
#define DBFLAG_InternalFunc   0x0020  /* Allow use of internal functions */
#define DBFLAG_EncodingFixed  0x0040  /* No longer possible to change enc. */

/*
** Bits of the sqlite3.dbOptFlags field that are used by the
** sqlite3_test_control(SQLITE_TESTCTRL_OPTIMIZATIONS,...) interface to
** selectively disable various optimizations.
*/
#define SQLITE_QueryFlattener 0x0001   /* Query flattening */
................................................................................
struct Expr {
  u8 op;                 /* Operation performed by this node */
  char affExpr;          /* affinity, or RAISE type */
  u8 op2;                /* TK_REGISTER/TK_TRUTH: original value of Expr.op
                         ** TK_COLUMN: the value of p5 for OP_Column
                         ** TK_AGG_FUNCTION: nesting depth
                         ** TK_FUNCTION: NC_SelfRef flag if needs OP_PureFunc */
#ifdef SQLITE_DEBUG
  u8 vvaFlags;           /* Verification flags. */
#endif
  u32 flags;             /* Various flags.  EP_* See below */
  union {
    char *zToken;          /* Token value. Zero terminated and dequoted */
    int iValue;            /* Non-negative integer value if EP_IntValue */
  } u;

  /* If the EP_TokenOnly flag is set in the Expr.flags mask, then no
................................................................................
#define EP_IntValue   0x000400 /* Integer value contained in u.iValue */
#define EP_xIsSelect  0x000800 /* x.pSelect is valid (otherwise x.pList is) */
#define EP_Skip       0x001000 /* Operator does not contribute to affinity */
#define EP_Reduced    0x002000 /* Expr struct EXPR_REDUCEDSIZE bytes only */
#define EP_TokenOnly  0x004000 /* Expr struct EXPR_TOKENONLYSIZE bytes only */
#define EP_Win        0x008000 /* Contains window functions */
#define EP_MemToken   0x010000 /* Need to sqlite3DbFree() Expr.zToken */
                  /*  0x020000 // available for reuse */
#define EP_Unlikely   0x040000 /* unlikely() or likelihood() function */
#define EP_ConstFunc  0x080000 /* A SQLITE_FUNC_CONSTANT or _SLOCHNG function */
#define EP_CanBeNull  0x100000 /* Can be null despite NOT NULL constraint */
#define EP_Subquery   0x200000 /* Tree contains a TK_SELECT operator */
#define EP_Alias      0x400000 /* Is an alias for a result set column */
#define EP_Leaf       0x800000 /* Expr.pLeft, .pRight, .u.pSelect all NULL */
#define EP_WinFunc   0x1000000 /* TK_FUNCTION with Expr.y.pWin set */
#define EP_Subrtn    0x2000000 /* Uses Expr.y.sub. TK_IN, _SELECT, or _EXISTS */
#define EP_Quoted    0x4000000 /* TK_ID was originally quoted */
#define EP_Static    0x8000000 /* Held in memory not obtained from malloc() */
#define EP_IsTrue   0x10000000 /* Always has boolean value of TRUE */
#define EP_IsFalse  0x20000000 /* Always has boolean value of FALSE */
#define EP_FromDDL  0x40000000 /* Originates from sqlite_master */
               /*   0x80000000 // Available */

/*
** The EP_Propagate mask is a set of properties that automatically propagate
** upwards into parent nodes.
*/
#define EP_Propagate (EP_Collate|EP_Subquery|EP_HasFunc)

................................................................................
#define ExprHasProperty(E,P)     (((E)->flags&(P))!=0)
#define ExprHasAllProperty(E,P)  (((E)->flags&(P))==(P))
#define ExprSetProperty(E,P)     (E)->flags|=(P)
#define ExprClearProperty(E,P)   (E)->flags&=~(P)
#define ExprAlwaysTrue(E)   (((E)->flags&(EP_FromJoin|EP_IsTrue))==EP_IsTrue)
#define ExprAlwaysFalse(E)  (((E)->flags&(EP_FromJoin|EP_IsFalse))==EP_IsFalse)


/* Flags for use with Expr.vvaFlags
*/
#define EP_NoReduce   0x01  /* Cannot EXPRDUP_REDUCE this Expr */
#define EP_Immutable  0x02  /* Do not change this Expr node */

/* The ExprSetVVAProperty() macro is used for Verification, Validation,
** and Accreditation only.  It works like ExprSetProperty() during VVA
** processes but is a no-op for delivery.
*/
#ifdef SQLITE_DEBUG
# define ExprSetVVAProperty(E,P)   (E)->vvaFlags|=(P)
# define ExprHasVVAProperty(E,P)   (((E)->vvaFlags&(P))!=0)
# define ExprClearVVAProperties(E) (E)->vvaFlags = 0
#else
# define ExprSetVVAProperty(E,P)
# define ExprHasVVAProperty(E,P)   0
# define ExprClearVVAProperties(E)
#endif

/*
** Macros to determine the number of bytes required by a normal Expr
** struct, an Expr struct with the EP_Reduced flag set in Expr.flags
** and an Expr struct with the EP_TokenOnly flag set.
*/
................................................................................
    struct IdxExprTrans *pIdxTrans;           /* Convert idxed expr to column */
    ExprList *pGroupBy;                       /* GROUP BY clause */
    Select *pSelect;                          /* HAVING to WHERE clause ctx */
    struct WindowRewrite *pRewrite;           /* Window rewrite context */
    struct WhereConst *pConst;                /* WHERE clause constants */
    struct RenameCtx *pRename;                /* RENAME COLUMN context */
    struct Table *pTab;                       /* Table of generated column */
    struct SrcList_item *pSrcItem;            /* A single FROM clause item */
  } u;
};

/* Forward declarations */
SQLITE_PRIVATE int sqlite3WalkExpr(Walker*, Expr*);
SQLITE_PRIVATE int sqlite3WalkExprList(Walker*, ExprList*);
SQLITE_PRIVATE int sqlite3WalkSelect(Walker*, Select*);
................................................................................
SQLITE_PRIVATE void sqlite3ExprCodeMove(Parse*, int, int, int);
SQLITE_PRIVATE void sqlite3ExprCode(Parse*, Expr*, int);
#ifndef SQLITE_OMIT_GENERATED_COLUMNS
SQLITE_PRIVATE void sqlite3ExprCodeGeneratedColumn(Parse*, Column*, int);
#endif
SQLITE_PRIVATE void sqlite3ExprCodeCopy(Parse*, Expr*, int);
SQLITE_PRIVATE void sqlite3ExprCodeFactorable(Parse*, Expr*, int);
SQLITE_PRIVATE int sqlite3ExprCodeRunJustOnce(Parse*, Expr*, int);
SQLITE_PRIVATE int sqlite3ExprCodeTemp(Parse*, Expr*, int*);
SQLITE_PRIVATE int sqlite3ExprCodeTarget(Parse*, Expr*, int);
SQLITE_PRIVATE int sqlite3ExprCodeExprList(Parse*, ExprList*, int, int, u8);
#define SQLITE_ECEL_DUP      0x01  /* Deep, not shallow copies */
#define SQLITE_ECEL_FACTOR   0x02  /* Factor out constant terms */
#define SQLITE_ECEL_REF      0x04  /* Use ExprList.u.x.iOrderByCol */
#define SQLITE_ECEL_OMITREF  0x08  /* Omit if ExprList.u.x.iOrderByCol */
................................................................................
SQLITE_PRIVATE   int sqlite3AuthReadCol(Parse*, const char *, const char *, int);
#else
# define sqlite3AuthRead(a,b,c,d)
# define sqlite3AuthCheck(a,b,c,d,e)    SQLITE_OK
# define sqlite3AuthContextPush(a,b,c)
# define sqlite3AuthContextPop(a)  ((void)(a))
#endif
SQLITE_PRIVATE int sqlite3DbIsNamed(sqlite3 *db, int iDb, const char *zName);
SQLITE_PRIVATE void sqlite3Attach(Parse*, Expr*, Expr*, Expr*);
SQLITE_PRIVATE void sqlite3Detach(Parse*, Expr*);
SQLITE_PRIVATE void sqlite3FixInit(DbFixer*, Parse*, int, const char*, const Token*);
SQLITE_PRIVATE int sqlite3FixSrcList(DbFixer*, SrcList*);
SQLITE_PRIVATE int sqlite3FixSelect(DbFixer*, Select*);
SQLITE_PRIVATE int sqlite3FixExpr(DbFixer*, Expr*);
SQLITE_PRIVATE int sqlite3FixExprList(DbFixer*, ExprList*);
................................................................................
  sqlite3PutVarint((A),(B)))
#define getVarint    sqlite3GetVarint
#define putVarint    sqlite3PutVarint


SQLITE_PRIVATE const char *sqlite3IndexAffinityStr(sqlite3*, Index*);
SQLITE_PRIVATE void sqlite3TableAffinity(Vdbe*, Table*, int);
SQLITE_PRIVATE char sqlite3CompareAffinity(const Expr *pExpr, char aff2);
SQLITE_PRIVATE int sqlite3IndexAffinityOk(const Expr *pExpr, char idx_affinity);
SQLITE_PRIVATE char sqlite3TableColumnAffinity(Table*,int);
SQLITE_PRIVATE char sqlite3ExprAffinity(const Expr *pExpr);
SQLITE_PRIVATE int sqlite3Atoi64(const char*, i64*, int, u8);
SQLITE_PRIVATE int sqlite3DecOrHexToI64(const char*, i64*);
SQLITE_PRIVATE void sqlite3ErrorWithMsg(sqlite3*, int, const char*,...);
SQLITE_PRIVATE void sqlite3Error(sqlite3*,int);
SQLITE_PRIVATE void sqlite3SystemError(sqlite3*,int);
SQLITE_PRIVATE void *sqlite3HexToBlob(sqlite3*, const char *z, int n);
SQLITE_PRIVATE u8 sqlite3HexToInt(int h);
................................................................................
#endif

SQLITE_PRIVATE const char *sqlite3ErrStr(int);
SQLITE_PRIVATE int sqlite3ReadSchema(Parse *pParse);
SQLITE_PRIVATE CollSeq *sqlite3FindCollSeq(sqlite3*,u8 enc, const char*,int);
SQLITE_PRIVATE int sqlite3IsBinary(const CollSeq*);
SQLITE_PRIVATE CollSeq *sqlite3LocateCollSeq(Parse *pParse, const char*zName);
SQLITE_PRIVATE void sqlite3SetTextEncoding(sqlite3 *db, u8);
SQLITE_PRIVATE CollSeq *sqlite3ExprCollSeq(Parse *pParse, const Expr *pExpr);
SQLITE_PRIVATE CollSeq *sqlite3ExprNNCollSeq(Parse *pParse, const Expr *pExpr);
SQLITE_PRIVATE int sqlite3ExprCollSeqMatch(Parse*,const Expr*,const Expr*);
SQLITE_PRIVATE Expr *sqlite3ExprAddCollateToken(Parse *pParse, Expr*, const Token*, int);
SQLITE_PRIVATE Expr *sqlite3ExprAddCollateString(Parse*,Expr*,const char*);
SQLITE_PRIVATE Expr *sqlite3ExprSkipCollate(Expr*);
SQLITE_PRIVATE Expr *sqlite3ExprSkipCollateAndLikely(Expr*);
SQLITE_PRIVATE int sqlite3CheckCollSeq(Parse *, CollSeq *);
SQLITE_PRIVATE int sqlite3WritableSchema(sqlite3*);
SQLITE_PRIVATE int sqlite3CheckObjectName(Parse*, const char*,const char*,const char*);
................................................................................
SQLITE_PRIVATE void sqlite3SelectWrongNumTermsError(Parse *pParse, Select *p);
SQLITE_PRIVATE int sqlite3MatchEName(
  const struct ExprList_item*,
  const char*,
  const char*,
  const char*
);
SQLITE_PRIVATE Bitmask sqlite3ExprColUsed(Expr*);
SQLITE_PRIVATE int sqlite3ResolveExprNames(NameContext*, Expr*);
SQLITE_PRIVATE int sqlite3ResolveExprListNames(NameContext*, ExprList*);
SQLITE_PRIVATE void sqlite3ResolveSelectNames(Parse*, Select*, NameContext*);
SQLITE_PRIVATE int sqlite3ResolveSelfReference(Parse*,Table*,int,Expr*,ExprList*);
SQLITE_PRIVATE int sqlite3ResolveOrderGroupBy(Parse*, Select*, ExprList*, const char*);
SQLITE_PRIVATE void sqlite3ColumnDefault(Vdbe *, Table *, int, int);
SQLITE_PRIVATE void sqlite3AlterFinishAddColumn(Parse *, Token *);
................................................................................
SQLITE_PRIVATE int sqlite3TransferBindings(sqlite3_stmt *, sqlite3_stmt *);
SQLITE_PRIVATE void sqlite3ParserReset(Parse*);
#ifdef SQLITE_ENABLE_NORMALIZE
SQLITE_PRIVATE char *sqlite3Normalize(Vdbe*, const char*);
#endif
SQLITE_PRIVATE int sqlite3Reprepare(Vdbe*);
SQLITE_PRIVATE void sqlite3ExprListCheckLength(Parse*, ExprList*, const char*);
SQLITE_PRIVATE CollSeq *sqlite3ExprCompareCollSeq(Parse*,const Expr*);
SQLITE_PRIVATE CollSeq *sqlite3BinaryCompareCollSeq(Parse *, const Expr*, const Expr*);
SQLITE_PRIVATE int sqlite3TempInMemory(const sqlite3*);
SQLITE_PRIVATE const char *sqlite3JournalModename(int);
#ifndef SQLITE_OMIT_WAL
SQLITE_PRIVATE   int sqlite3Checkpoint(sqlite3*, int, int, int*, int*);
SQLITE_PRIVATE   int sqlite3WalDefaultHook(void*,sqlite3*,const char*,int);
#endif
#ifndef SQLITE_OMIT_CTE
................................................................................
  int rcApp;              /* errcode set by sqlite3_result_error_code() */
  u32 nWrite;             /* Number of write operations that have occurred */
#endif
  u16 nResColumn;         /* Number of columns in one row of the result set */
  u8 errorAction;         /* Recovery action to do in case of an error */
  u8 minWriteFileFormat;  /* Minimum file format for writable database files */
  u8 prepFlags;           /* SQLITE_PREPARE_* flags */
  u8 doingRerun;          /* True if rerunning after an auto-reprepare */
  bft expired:2;          /* 1: recompile VM immediately  2: when convenient */
  bft explain:2;          /* True if EXPLAIN present on SQL command */

  bft changeCntOn:1;      /* True to update the change-counter */
  bft runOnlyOnce:1;      /* Automatically expire on reset */
  bft usesStmtJournal:1;  /* True if uses a statement journal */
  bft readOnly:1;         /* True for statements that do not write */
  bft bIsReader:1;        /* True for statements that read */
  yDbMask btreeMask;      /* Bitmask of db->aDb[] entries referenced */
  yDbMask lockMask;       /* Subset of btreeMask that requires a lock */
................................................................................
    sqlite3_str_appendf(&x, "{%d:*}", pItem->iCursor);
    if( pItem->zDatabase ){
      sqlite3_str_appendf(&x, " %s.%s", pItem->zDatabase, pItem->zName);
    }else if( pItem->zName ){
      sqlite3_str_appendf(&x, " %s", pItem->zName);
    }
    if( pItem->pTab ){
      sqlite3_str_appendf(&x, " tab=%Q nCol=%d ptr=%p used=%llx",
           pItem->pTab->zName, pItem->pTab->nCol, pItem->pTab, pItem->colUsed);
    }
    if( pItem->zAlias ){
      sqlite3_str_appendf(&x, " (AS %s)", pItem->zAlias);
    }
    if( pItem->fg.jointype & JT_LEFT ){
      sqlite3_str_appendf(&x, " LEFT-JOIN");
    }
................................................................................

/*
** Generate a human-readable explanation of an expression tree.
*/
SQLITE_PRIVATE void sqlite3TreeViewExpr(TreeView *pView, const Expr *pExpr, u8 moreToFollow){
  const char *zBinOp = 0;   /* Binary operator */
  const char *zUniOp = 0;   /* Unary operator */
  char zFlgs[200];
  pView = sqlite3TreeViewPush(pView, moreToFollow);
  if( pExpr==0 ){
    sqlite3TreeViewLine(pView, "nil");
    sqlite3TreeViewPop(pView);
    return;
  }
  if( pExpr->flags || pExpr->affExpr || pExpr->vvaFlags ){
    StrAccum x;
    sqlite3StrAccumInit(&x, 0, zFlgs, sizeof(zFlgs), 0);
    sqlite3_str_appendf(&x, " fg.af=%x.%c",
      pExpr->flags, pExpr->affExpr ? pExpr->affExpr : 'n');
    if( ExprHasProperty(pExpr, EP_FromJoin) ){
      sqlite3_str_appendf(&x, " iRJT=%d", pExpr->iRightJoinTable);
    }
    if( ExprHasProperty(pExpr, EP_FromDDL) ){
      sqlite3_str_appendf(&x, " DDL");
    }
    if( ExprHasVVAProperty(pExpr, EP_Immutable) ){
      sqlite3_str_appendf(&x, " IMMUTABLE");
    }
    sqlite3StrAccumFinish(&x);
  }else{
    zFlgs[0] = 0;
  }
  switch( pExpr->op ){
    case TK_AGG_COLUMN: {
................................................................................
    case TK_BITAND:  zBinOp = "BITAND"; break;
    case TK_BITOR:   zBinOp = "BITOR";  break;
    case TK_SLASH:   zBinOp = "DIV";    break;
    case TK_LSHIFT:  zBinOp = "LSHIFT"; break;
    case TK_RSHIFT:  zBinOp = "RSHIFT"; break;
    case TK_CONCAT:  zBinOp = "CONCAT"; break;
    case TK_DOT:     zBinOp = "DOT";    break;
    case TK_LIMIT:   zBinOp = "LIMIT";  break;

    case TK_UMINUS:  zUniOp = "UMINUS"; break;
    case TK_UPLUS:   zUniOp = "UPLUS";  break;
    case TK_BITNOT:  zUniOp = "BITNOT"; break;
    case TK_NOT:     zUniOp = "NOT";    break;
    case TK_ISNULL:  zUniOp = "ISNULL"; break;
    case TK_NOTNULL: zUniOp = "NOTNULL"; break;
................................................................................
  sqlite3RowSetClear(pArg);
  sqlite3DbFree(((RowSet*)pArg)->db, pArg);
}

/*
** Allocate a new RowSetEntry object that is associated with the
** given RowSet.  Return a pointer to the new and completely uninitialized
** object.
**
** In an OOM situation, the RowSet.db->mallocFailed flag is set and this
** routine returns NULL.
*/
static struct RowSetEntry *rowSetEntryAlloc(RowSet *p){
  assert( p!=0 );
  if( p->nFresh==0 ){  /*OPTIMIZATION-IF-FALSE*/
................................................................................
  ** To save unnecessary work, only do this when the batch number changes.
  */
  if( iBatch!=pRowSet->iBatch ){  /*OPTIMIZATION-IF-FALSE*/
    p = pRowSet->pEntry;
    if( p ){
      struct RowSetEntry **ppPrevTree = &pRowSet->pForest;
      if( (pRowSet->rsFlags & ROWSET_SORTED)==0 ){ /*OPTIMIZATION-IF-FALSE*/
        /* Only sort the current set of entries if they need it */
        p = rowSetEntrySort(p);
      }
      for(pTree = pRowSet->pForest; pTree; pTree=pTree->pRight){
        ppPrevTree = &pTree->pRight;
        if( pTree->pLeft==0 ){
          pTree->pLeft = rowSetListToTree(p);
          break;
................................................................................
**
** This function is called when a free-list leaf page is removed from the
** free-list for reuse. It returns false if it is safe to retrieve the
** page from the pager layer with the 'no-content' flag set. True otherwise.
*/
static int btreeGetHasContent(BtShared *pBt, Pgno pgno){
  Bitvec *p = pBt->pHasContent;
  return p && (pgno>sqlite3BitvecSize(p) || sqlite3BitvecTestNotNull(p, pgno));
}

/*
** Clear (destroy) the BtShared.pHasContent bitvec. This should be
** invoked at the conclusion of each write-transaction.
*/
static void btreeClearHasContent(BtShared *pBt){
................................................................................
  for(i=1, pX=pVdbe->aMem+1; i<pVdbe->nMem; i++, pX++){
    if( pX->pScopyFrom==pMem ){
      u16 mFlags;
      if( pVdbe->db->flags & SQLITE_VdbeTrace ){
        sqlite3DebugPrintf("Invalidate R[%d] due to change in R[%d]\n",
          (int)(pX - pVdbe->aMem), (int)(pMem - pVdbe->aMem));
      }
      /* If pX is marked as a shallow copy of pMem, then try to verify that
      ** no significant changes have been made to pX since the OP_SCopy.
      ** A significant change would indicated a missed call to this
      ** function for pX.  Minor changes, such as adding or removing a
      ** dual type, are allowed, as long as the underlying value is the
      ** same. */
      mFlags = pMem->flags & pX->flags & pX->mScopyFlags;
      assert( (mFlags&(MEM_Int|MEM_IntReal))==0 || pMem->u.i==pX->u.i );





      
      /* pMem is the register that is changing.  But also mark pX as
      ** undefined so that we can quickly detect the shallow-copy error */
      pX->flags = MEM_Undefined;
      pX->pScopyFrom = 0;
    }
  }
................................................................................
SQLITE_PRIVATE void sqlite3ExplainBreakpoint(const char *z1, const char *z2){
  (void)z1;
  (void)z2;
}
#endif

/*
** Add a new OP_Explain opcode.
**
** If the bPush flag is true, then make this opcode the parent for
** subsequent Explains until sqlite3VdbeExplainPop() is called.
*/
SQLITE_PRIVATE void sqlite3VdbeExplain(Parse *pParse, u8 bPush, const char *zFmt, ...){
#ifndef SQLITE_DEBUG
  /* Always include the OP_Explain opcodes if SQLITE_DEBUG is defined.
................................................................................
#ifdef SQLITE_ENABLE_CURSOR_HINTS
    case P4_EXPR: {
      displayP4Expr(&x, pOp->p4.pExpr);
      break;
    }
#endif
    case P4_COLLSEQ: {
      static const char *const encnames[] = {"?", "8", "16LE", "16BE"};
      CollSeq *pColl = pOp->p4.pColl;
      assert( pColl->enc>=0 && pColl->enc<4 );
      sqlite3_str_appendf(&x, "%.18s-%s", pColl->zName,
                          encnames[pColl->enc]);
      break;
    }
    case P4_FUNCDEF: {
      FuncDef *pDef = pOp->p4.pFunc;
      sqlite3_str_appendf(&x, "%s(%d)", pDef->zName, pDef->nArg);
      break;
    }
................................................................................
  if( pParse->explain ){
    static const char * const azColName[] = {
       "addr", "opcode", "p1", "p2", "p3", "p4", "p5", "comment",
       "id", "parent", "notused", "detail"
    };
    int iFirst, mx, i;
    if( nMem<10 ) nMem = 10;
    p->explain = pParse->explain;
    if( pParse->explain==2 ){
      sqlite3VdbeSetNumCols(p, 4);
      iFirst = 8;
      mx = 12;
    }else{
      sqlite3VdbeSetNumCols(p, 8);
      iFirst = 0;
................................................................................
      p->anExec = allocSpace(&x, p->anExec, p->nOp*sizeof(i64));
#endif
    }
  }

  p->pVList = pParse->pVList;
  pParse->pVList =  0;

  if( db->mallocFailed ){
    p->nVar = 0;
    p->nCursor = 0;
    p->nMem = 0;
  }else{
    p->nCursor = nCursor;
    p->nVar = (ynVar)nVar;
................................................................................
  i64 nByte;          /* Total size of the output string or blob */
  u16 flags1;         /* Initial flags for P1 */
  u16 flags2;         /* Initial flags for P2 */

  pIn1 = &aMem[pOp->p1];
  pIn2 = &aMem[pOp->p2];
  pOut = &aMem[pOp->p3];

  testcase( pOut==pIn2 );
  assert( pIn1!=pOut );
  flags1 = pIn1->flags;
  testcase( flags1 & MEM_Null );
  testcase( pIn2->flags & MEM_Null );
  if( (flags1 | pIn2->flags) & MEM_Null ){
    sqlite3VdbeMemSetNull(pOut);
................................................................................
** values need not be contiguous but all P1 values should be small integers.
** It is an error for P1 to be negative.
**
** Allowed P5 bits:
** <ul>
** <li>  <b>0x02 OPFLAG_SEEKEQ</b>: This cursor will only be used for
**       equality lookups (implemented as a pair of opcodes OP_SeekGE/OP_IdxGT
**       of OP_SeekLE/OP_IdxLT)
** </ul>
**
** The P4 value may be either an integer (P4_INT32) or a pointer to
** a KeyInfo structure (P4_KEYINFO). If it is a pointer to a KeyInfo 
** object, then table being opened must be an [index b-tree] where the
** KeyInfo object defines the content and collating 
** sequence of that index b-tree. Otherwise, if P4 is an integer 
................................................................................
** be the same as every other ReopenIdx or OpenRead for the same cursor
** number.
**
** Allowed P5 bits:
** <ul>
** <li>  <b>0x02 OPFLAG_SEEKEQ</b>: This cursor will only be used for
**       equality lookups (implemented as a pair of opcodes OP_SeekGE/OP_IdxGT
**       of OP_SeekLE/OP_IdxLT)
** </ul>
**
** See also: OP_OpenRead, OP_OpenWrite
*/
/* Opcode: OpenWrite P1 P2 P3 P4 P5
** Synopsis: root=P2 iDb=P3
**
................................................................................
** value, then the table being opened must be a [table b-tree] with a
** number of columns no less than the value of P4.
**
** Allowed P5 bits:
** <ul>
** <li>  <b>0x02 OPFLAG_SEEKEQ</b>: This cursor will only be used for
**       equality lookups (implemented as a pair of opcodes OP_SeekGE/OP_IdxGT
**       of OP_SeekLE/OP_IdxLT)
** <li>  <b>0x08 OPFLAG_FORDELETE</b>: This cursor is used only to seek
**       and subsequently delete entries in an index btree.  This is a
**       hint to the storage engine that the storage engine is allowed to
**       ignore.  The hint is not used by the official SQLite b*tree storage
**       engine, but is used by COMDB2.
** <li>  <b>0x10 OPFLAG_P2ISREG</b>: Use the content of register P2
**       as the root page, not the value of P2 itself.
................................................................................
  ** since moved into the btree layer.  */  
  pCur->isTable = pOp->p4type!=P4_KEYINFO;

open_cursor_set_hints:
  assert( OPFLAG_BULKCSR==BTREE_BULKLOAD );
  assert( OPFLAG_SEEKEQ==BTREE_SEEK_EQ );
  testcase( pOp->p5 & OPFLAG_BULKCSR );

  testcase( pOp->p2 & OPFLAG_SEEKEQ );

  sqlite3BtreeCursorHintFlags(pCur->uc.pCursor,
                               (pOp->p5 & (OPFLAG_BULKCSR|OPFLAG_SEEKEQ)));
  if( rc ) goto abort_due_to_error;
  break;
}

/* Opcode: OpenDup P1 P2 * * *
................................................................................
** that are used as an unpacked index key. 
**
** Reposition cursor P1 so that  it points to the smallest entry that 
** is greater than or equal to the key value. If there are no records 
** greater than or equal to the key and P2 is not zero, then jump to P2.
**
** If the cursor P1 was opened using the OPFLAG_SEEKEQ flag, then this
** opcode will either land on a record that exactly matches the key, or
** else it will cause a jump to P2.  When the cursor is OPFLAG_SEEKEQ,
** this opcode must be followed by an IdxLE opcode with the same arguments.
** The IdxGT opcode will be skipped if this opcode succeeds, but the
** IdxGT opcode will be used on subsequent loop iterations.  The 
** OPFLAG_SEEKEQ flags is a hint to the btree layer to say that this
** is an equality search.
**
** This opcode leaves the cursor configured to move in forward order,
** from the beginning toward the end.  In other words, the cursor is
** configured to use Next, not Prev.
**
** See also: Found, NotFound, SeekLt, SeekGt, SeekLe
*/
................................................................................
** Synopsis: key=r[P3@P4]
**
** If cursor P1 refers to an SQL table (B-Tree that uses integer keys), 
** use the value in register P3 as a key. If cursor P1 refers 
** to an SQL index, then P3 is the first in an array of P4 registers 
** that are used as an unpacked index key. 
**
** Reposition cursor P1 so that it points to the smallest entry that 
** is greater than the key value. If there are no records greater than 
** the key and P2 is not zero, then jump to P2.
**
** This opcode leaves the cursor configured to move in forward order,
** from the beginning toward the end.  In other words, the cursor is
** configured to use Next, not Prev.
**
................................................................................
** less than or equal to the key and P2 is not zero, then jump to P2.
**
** This opcode leaves the cursor configured to move in reverse order,
** from the end toward the beginning.  In other words, the cursor is
** configured to use Prev, not Next.
**
** If the cursor P1 was opened using the OPFLAG_SEEKEQ flag, then this
** opcode will either land on a record that exactly matches the key, or
** else it will cause a jump to P2.  When the cursor is OPFLAG_SEEKEQ,
** this opcode must be followed by an IdxLE opcode with the same arguments.
** The IdxGE opcode will be skipped if this opcode succeeds, but the
** IdxGE opcode will be used on subsequent loop iterations.  The 
** OPFLAG_SEEKEQ flags is a hint to the btree layer to say that this
** is an equality search.
**
** See also: Found, NotFound, SeekGt, SeekGe, SeekLt
*/
case OP_SeekLT:         /* jump, in3, group */
case OP_SeekLE:         /* jump, in3, group */
case OP_SeekGE:         /* jump, in3, group */
case OP_SeekGT: {       /* jump, in3, group */
................................................................................
  pC->seekOp = pOp->opcode;
#endif

  pC->deferredMoveto = 0;
  pC->cacheStatus = CACHE_STALE;
  if( pC->isTable ){
    u16 flags3, newType;
    /* The OPFLAG_SEEKEQ/BTREE_SEEK_EQ flag is only set on index cursors */
    assert( sqlite3BtreeCursorHasHint(pC->uc.pCursor, BTREE_SEEK_EQ)==0
              || CORRUPT_DB );

    /* The input value in P3 might be of any type: integer, real, string,
    ** blob, or NULL.  But it needs to be an integer before we can do
    ** the seek, so convert it. */
    pIn3 = &aMem[pOp->p3];
................................................................................
    }
    rc = sqlite3BtreeMovetoUnpacked(pC->uc.pCursor, 0, (u64)iKey, 0, &res);
    pC->movetoTarget = iKey;  /* Used by OP_Delete */
    if( rc!=SQLITE_OK ){
      goto abort_due_to_error;
    }
  }else{
    /* For a cursor with the OPFLAG_SEEKEQ/BTREE_SEEK_EQ hint, only the
    ** OP_SeekGE and OP_SeekLE opcodes are allowed, and these must be
    ** immediately followed by an OP_IdxGT or OP_IdxLT opcode, respectively,
    ** with the same key.
    */
    if( sqlite3BtreeCursorHasHint(pC->uc.pCursor, BTREE_SEEK_EQ) ){
      eqOnly = 1;
      assert( pOp->opcode==OP_SeekGE || pOp->opcode==OP_SeekLE );
      assert( pOp[1].opcode==OP_IdxLT || pOp[1].opcode==OP_IdxGT );
      assert( pOp->opcode==OP_SeekGE || pOp[1].opcode==OP_IdxLT );
      assert( pOp->opcode==OP_SeekLE || pOp[1].opcode==OP_IdxGT );
      assert( pOp[1].p1==pOp[0].p1 );
      assert( pOp[1].p2==pOp[0].p2 );
      assert( pOp[1].p3==pOp[0].p3 );
      assert( pOp[1].p4.i==pOp[0].p4.i );
    }

    nField = pOp->p4.i;
................................................................................
#ifdef SQLITE_DEBUG
  /* Verify that second and subsequent executions of the same trigger do not
  ** try to reuse register values from the first use. */
  {
    int i;
    for(i=0; i<p->nMem; i++){
      aMem[i].pScopyFrom = 0;  /* Prevent false-positive AboutToChange() errs */
      MemSetTypeFlag(&aMem[i], MEM_Undefined); /* Fault if this reg is reused */
    }
  }
#endif
  pOp = &aOp[-1];
  goto check_for_interrupt;
}

................................................................................
*/
SQLITE_PRIVATE int sqlite3WalkSelectFrom(Walker *pWalker, Select *p){
  SrcList *pSrc;
  int i;
  struct SrcList_item *pItem;

  pSrc = p->pSrc;
  if( pSrc ){
    for(i=pSrc->nSrc, pItem=pSrc->a; i>0; i--, pItem++){
      if( pItem->pSelect && sqlite3WalkSelect(pWalker, pItem->pSelect) ){
        return WRC_Abort;
      }
      if( pItem->fg.isTabFunc
       && sqlite3WalkExprList(pWalker, pItem->u1.pFuncArg)
      ){
        return WRC_Abort;
      }
    }
  }
  return WRC_Continue;
} 

/*
** Call sqlite3WalkExpr() for every expression in Select statement p.
................................................................................
    }
    return (db->flags & SQLITE_DqsDDL)!=0;
  }else{
    /* Currently parsing a DML statement */
    return (db->flags & SQLITE_DqsDML)!=0;
  }
}

/*
** The argument is guaranteed to be a non-NULL Expr node of type TK_COLUMN.
** return the appropriate colUsed mask.
*/
SQLITE_PRIVATE Bitmask sqlite3ExprColUsed(Expr *pExpr){
  int n;
  Table *pExTab;

  n = pExpr->iColumn;
  pExTab = pExpr->y.pTab;
  assert( pExTab!=0 );
  if( (pExTab->tabFlags & TF_HasGenerated)!=0
   && (pExTab->aCol[n].colFlags & COLFLAG_GENERATED)!=0 
  ){
    testcase( pExTab->nCol==BMS-1 );
    testcase( pExTab->nCol==BMS );
    return pExTab->nCol>=BMS ? ALLBITS : MASKBIT(pExTab->nCol)-1;
  }else{
    testcase( n==BMS-1 );
    testcase( n==BMS );
    if( n>=BMS ) n = BMS-1;
    return ((Bitmask)1)<<n;
  }
}

/*
** Given the name of a column of the form X.Y.Z or Y.Z or just Z, look up
** that name in the set of source tables in pSrcList and make the pExpr 
** expression node refer back to that source column.  The following changes
** are made to pExpr:
**
................................................................................
    }else{
      for(i=0; i<db->nDb; i++){
        assert( db->aDb[i].zDbSName );
        if( sqlite3StrICmp(db->aDb[i].zDbSName,zDb)==0 ){
          pSchema = db->aDb[i].pSchema;
          break;
        }
      }
      if( i==db->nDb && sqlite3StrICmp("main", zDb)==0 ){
        /* This branch is taken when the main database has been renamed
        ** using SQLITE_DBCONFIG_MAINDBNAME. */
        pSchema = db->aDb[0].pSchema;
        zDb = db->aDb[0].zDbSName;
      }
    }
  }

  /* Start at the inner-most context and move outward until a match is found */
  assert( pNC && cnt==0 );
  do{
................................................................................
  ** avoid setting bits beyond the maximum column number of the table.
  ** (See ticket [b92e5e8ec2cdbaa1]).
  **
  ** If a generated column is referenced, set bits for every column
  ** of the table.
  */
  if( pExpr->iColumn>=0 && pMatch!=0 ){














    pMatch->colUsed |= sqlite3ExprColUsed(pExpr);

  }

  /* Clean up and return
  */
  sqlite3ExprDelete(db, pExpr->pLeft);
  pExpr->pLeft = 0;
  sqlite3ExprDelete(db, pExpr->pRight);
................................................................................
** have an affinity:
**
** CREATE TABLE t1(a);
** SELECT * FROM t1 WHERE a;
** SELECT a AS b FROM t1 WHERE b;
** SELECT * FROM t1 WHERE (select a from t1);
*/
SQLITE_PRIVATE char sqlite3ExprAffinity(const Expr *pExpr){
  int op;
  while( ExprHasProperty(pExpr, EP_Skip) ){
    assert( pExpr->op==TK_COLLATE );
    pExpr = pExpr->pLeft;
    assert( pExpr!=0 );
  }
  op = pExpr->op;
................................................................................
** default collation if pExpr has no defined collation.
**
** The collating sequence might be determined by a COLLATE operator
** or by the presence of a column with a defined collating sequence.
** COLLATE operators take first precedence.  Left operands take
** precedence over right operands.
*/
SQLITE_PRIVATE CollSeq *sqlite3ExprCollSeq(Parse *pParse, const Expr *pExpr){
  sqlite3 *db = pParse->db;
  CollSeq *pColl = 0;
  const Expr *p = pExpr;
  while( p ){
    int op = p->op;
    if( op==TK_REGISTER ) op = p->op2;
    if( (op==TK_AGG_COLUMN || op==TK_COLUMN || op==TK_TRIGGER)
     && p->y.pTab!=0
    ){
      /* op==TK_REGISTER && p->y.pTab!=0 happens when pExpr was originally
................................................................................
** defautl collation sequence.
**
** See also: sqlite3ExprCollSeq()
**
** The sqlite3ExprCollSeq() routine works the same except that it
** returns NULL if there is no defined collation.
*/
SQLITE_PRIVATE CollSeq *sqlite3ExprNNCollSeq(Parse *pParse, const Expr *pExpr){
  CollSeq *p = sqlite3ExprCollSeq(pParse, pExpr);
  if( p==0 ) p = pParse->db->pDfltColl;
  assert( p!=0 );
  return p;
}

/*
** Return TRUE if the two expressions have equivalent collating sequences.
*/
SQLITE_PRIVATE int sqlite3ExprCollSeqMatch(Parse *pParse, const Expr *pE1, const Expr *pE2){
  CollSeq *pColl1 = sqlite3ExprNNCollSeq(pParse, pE1);
  CollSeq *pColl2 = sqlite3ExprNNCollSeq(pParse, pE2);
  return sqlite3StrICmp(pColl1->zName, pColl2->zName)==0;
}

/*
** pExpr is an operand of a comparison operator.  aff2 is the
** type affinity of the other operand.  This routine returns the
** type affinity that should be used for the comparison operator.
*/
SQLITE_PRIVATE char sqlite3CompareAffinity(const Expr *pExpr, char aff2){
  char aff1 = sqlite3ExprAffinity(pExpr);
  if( aff1>SQLITE_AFF_NONE && aff2>SQLITE_AFF_NONE ){
    /* Both sides of the comparison are columns. If one has numeric
    ** affinity, use that. Otherwise use no affinity.
    */
    if( sqlite3IsNumericAffinity(aff1) || sqlite3IsNumericAffinity(aff2) ){
      return SQLITE_AFF_NUMERIC;
................................................................................
  }
}

/*
** pExpr is a comparison operator.  Return the type affinity that should
** be applied to both operands prior to doing the comparison.
*/
static char comparisonAffinity(const Expr *pExpr){
  char aff;
  assert( pExpr->op==TK_EQ || pExpr->op==TK_IN || pExpr->op==TK_LT ||
          pExpr->op==TK_GT || pExpr->op==TK_GE || pExpr->op==TK_LE ||
          pExpr->op==TK_NE || pExpr->op==TK_IS || pExpr->op==TK_ISNOT );
  assert( pExpr->pLeft );
  aff = sqlite3ExprAffinity(pExpr->pLeft);
  if( pExpr->pRight ){
................................................................................

/*
** pExpr is a comparison expression, eg. '=', '<', IN(...) etc.
** idx_affinity is the affinity of an indexed column. Return true
** if the index with affinity idx_affinity may be used to implement
** the comparison in pExpr.
*/
SQLITE_PRIVATE int sqlite3IndexAffinityOk(const Expr *pExpr, char idx_affinity){
  char aff = comparisonAffinity(pExpr);
  if( aff<SQLITE_AFF_TEXT ){
    return 1;
  }
  if( aff==SQLITE_AFF_TEXT ){
    return idx_affinity==SQLITE_AFF_TEXT;
  }
................................................................................
  return sqlite3IsNumericAffinity(idx_affinity);
}

/*
** Return the P5 value that should be used for a binary comparison
** opcode (OP_Eq, OP_Ge etc.) used to compare pExpr1 and pExpr2.
*/
static u8 binaryCompareP5(
  const Expr *pExpr1,   /* Left operand */
  const Expr *pExpr2,   /* Right operand */
  int jumpIfNull        /* Extra flags added to P5 */
){
  u8 aff = (char)sqlite3ExprAffinity(pExpr2);
  aff = (u8)sqlite3CompareAffinity(pExpr1, aff) | (u8)jumpIfNull;
  return aff;
}

/*
** Return a pointer to the collation sequence that should be used by
................................................................................
** type.
**
** Argument pRight (but not pLeft) may be a null pointer. In this case,
** it is not considered.
*/
SQLITE_PRIVATE CollSeq *sqlite3BinaryCompareCollSeq(
  Parse *pParse, 
  const Expr *pLeft, 
  const Expr *pRight
){
  CollSeq *pColl;
  assert( pLeft );
  if( pLeft->flags & EP_Collate ){
    pColl = sqlite3ExprCollSeq(pParse, pLeft);
  }else if( pRight && (pRight->flags & EP_Collate)!=0 ){
    pColl = sqlite3ExprCollSeq(pParse, pRight);
................................................................................
** appropriate for the comparison operator.
**
** This is normally just a wrapper around sqlite3BinaryCompareCollSeq().
** However, if the OP_Commuted flag is set, then the order of the operands
** is reversed in the sqlite3BinaryCompareCollSeq() call so that the
** correct collating sequence is found.
*/
SQLITE_PRIVATE CollSeq *sqlite3ExprCompareCollSeq(Parse *pParse, const Expr *p){
  if( ExprHasProperty(p, EP_Commuted) ){
    return sqlite3BinaryCompareCollSeq(pParse, p->pRight, p->pLeft);
  }else{
    return sqlite3BinaryCompareCollSeq(pParse, p->pLeft, p->pRight);
  }
}

................................................................................
  int i;
  int regLeft = 0;
  int regRight = 0;
  u8 opx = op;
  int addrDone = sqlite3VdbeMakeLabel(pParse);
  int isCommuted = ExprHasProperty(pExpr,EP_Commuted);

  assert( !ExprHasVVAProperty(pExpr,EP_Immutable) );
  if( pParse->nErr ) return;
  if( nLeft!=sqlite3ExprVectorSize(pRight) ){
    sqlite3ErrorMsg(pParse, "row value misused");
    return;
  }
  assert( pExpr->op==TK_EQ || pExpr->op==TK_NE 
       || pExpr->op==TK_IS || pExpr->op==TK_ISNOT 
................................................................................
#endif
  ){
    nSize = EXPR_FULLSIZE;
  }else{
    assert( !ExprHasProperty(p, EP_TokenOnly|EP_Reduced) );
    assert( !ExprHasProperty(p, EP_FromJoin) ); 
    assert( !ExprHasProperty(p, EP_MemToken) );
    assert( !ExprHasVVAProperty(p, EP_NoReduce) );
    if( p->pLeft || p->x.pList ){
      nSize = EXPR_REDUCEDSIZE | EP_Reduced;
    }else{
      assert( p->pRight==0 );
      nSize = EXPR_TOKENONLYSIZE | EP_TokenOnly;
    }
  }
................................................................................
      }
    }

    /* Set the EP_Reduced, EP_TokenOnly, and EP_Static flags appropriately. */
    pNew->flags &= ~(EP_Reduced|EP_TokenOnly|EP_Static|EP_MemToken);
    pNew->flags |= nStructSize & (EP_Reduced|EP_TokenOnly);
    pNew->flags |= staticFlag;
    ExprClearVVAProperties(pNew);
    if( dupFlags ){
      ExprSetVVAProperty(pNew, EP_Immutable);
    }

    /* Copy the p->u.zToken string, if any. */
    if( nToken ){
      char *zToken = pNew->u.zToken = (char*)&zAlloc[nNewSize];
      memcpy(zToken, p->u.zToken, nToken);
    }

................................................................................
**   (2) the expression does originate in the ON or USING clause
**       of a LEFT JOIN, and
**   (3) the expression does not contain any EP_FixedCol TK_COLUMN
**       operands created by the constant propagation optimization.
**
** When this routine returns true, it indicates that the expression
** can be added to the pParse->pConstExpr list and evaluated once when
** the prepared statement starts up.  See sqlite3ExprCodeRunJustOnce().
*/
SQLITE_PRIVATE int sqlite3ExprIsConstantNotJoin(Expr *p){
  return exprIsConst(p, 2, 0);
}

/*
** Walk an expression tree.  Return non-zero if the expression is constant
................................................................................
      sqlite3VdbeAddOp2(v, OP_OpenDup, iTab, pExpr->iTable);
      sqlite3VdbeJumpHere(v, addrOnce);
      return;
    }

    /* Begin coding the subroutine */
    ExprSetProperty(pExpr, EP_Subrtn);
    assert( !ExprHasProperty(pExpr, EP_TokenOnly|EP_Reduced) );
    pExpr->y.sub.regReturn = ++pParse->nMem;
    pExpr->y.sub.iAddr =
      sqlite3VdbeAddOp2(v, OP_Integer, 0, pExpr->y.sub.regReturn) + 1;
    VdbeComment((v, "return address"));

    addrOnce = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
  }
................................................................................
  int destStep2;        /* Where to jump when NULLs seen in step 2 */
  int destStep6 = 0;    /* Start of code for Step 6 */
  int addrTruthOp;      /* Address of opcode that determines the IN is true */
  int destNotNull;      /* Jump here if a comparison is not true in step 6 */
  int addrTop;          /* Top of the step-6 loop */ 
  int iTab = 0;         /* Index to use */

  assert( !ExprHasVVAProperty(pExpr,EP_Immutable) );
  pLeft = pExpr->pLeft;
  if( sqlite3ExprCheckIN(pParse, pExpr) ) return;
  zAff = exprINAffinity(pParse, pExpr);
  nVector = sqlite3ExprVectorSize(pExpr->pLeft);
  aiMap = (int*)sqlite3DbMallocZero(
      pParse->db, nVector*(sizeof(int) + sizeof(char)) + 1
  );
................................................................................
  assert( v!=0 );
  assert( pParse->iSelfTab!=0 );
  if( pParse->iSelfTab>0 ){
    iAddr = sqlite3VdbeAddOp3(v, OP_IfNullRow, pParse->iSelfTab-1, 0, regOut);
  }else{
    iAddr = 0;
  }
  sqlite3ExprCodeCopy(pParse, pCol->pDflt, regOut);
  if( pCol->affinity>=SQLITE_AFF_TEXT ){
    sqlite3VdbeAddOp4(v, OP_Affinity, regOut, 1, 0, &pCol->affinity, 1);
  }
  if( iAddr ) sqlite3VdbeJumpHere(v, iAddr);
}
#endif /* SQLITE_OMIT_GENERATED_COLUMNS */

................................................................................
    return 0;
  }

expr_code_doover:
  if( pExpr==0 ){
    op = TK_NULL;
  }else{
    assert( !ExprHasVVAProperty(pExpr,EP_Immutable) );
    op = pExpr->op;
  }
  switch( op ){
    case TK_AGG_COLUMN: {
      AggInfo *pAggInfo = pExpr->pAggInfo;
      struct AggInfo_col *pCol = &pAggInfo->aCol[pExpr->iAgg];
      if( !pAggInfo->directMode ){
        assert( pCol->iMem>0 );
        return pCol->iMem;
      }else if( pAggInfo->useSortingIdx ){
        Table *pTab = pCol->pTab;
        sqlite3VdbeAddOp3(v, OP_Column, pAggInfo->sortingIdxPTab,
                              pCol->iSorterColumn, target);
        if( pCol->iColumn<0 ){
          VdbeComment((v,"%s.rowid",pTab->zName));
        }else{
          VdbeComment((v,"%s.%s",pTab->zName,pTab->aCol[pCol->iColumn].zName));
          if( pTab->aCol[pCol->iColumn].affinity==SQLITE_AFF_REAL ){
            sqlite3VdbeAddOp1(v, OP_RealAffinity, target);
          }
        }
        return target;
      }
      /* Otherwise, fall thru into the TK_COLUMN case */
    }
    case TK_COLUMN: {
      int iTab = pExpr->iTable;
      int iReg;
................................................................................
        codeReal(v, pLeft->u.zToken, 1, target);
        return target;
#endif
      }else{
        tempX.op = TK_INTEGER;
        tempX.flags = EP_IntValue|EP_TokenOnly;
        tempX.u.iValue = 0;
        ExprClearVVAProperties(&tempX);
        r1 = sqlite3ExprCodeTemp(pParse, &tempX, &regFree1);
        r2 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree2);
        sqlite3VdbeAddOp3(v, OP_Subtract, r2, r1, target);
        testcase( regFree2==0 );
      }
      break;
    }
................................................................................
#ifndef SQLITE_OMIT_WINDOWFUNC
      if( ExprHasProperty(pExpr, EP_WinFunc) ){
        return pExpr->y.pWin->regResult;
      }
#endif

      if( ConstFactorOk(pParse) && sqlite3ExprIsConstantNotJoin(pExpr) ){
        /* SQL functions can be expensive. So try to avoid running them
        ** multiple times if we know they always give the same result */
        return sqlite3ExprCodeRunJustOnce(pParse, pExpr, -1);
      }
      assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
      assert( !ExprHasProperty(pExpr, EP_TokenOnly) );


      pFarg = pExpr->x.pList;

      nFarg = pFarg ? pFarg->nExpr : 0;
      assert( !ExprHasProperty(pExpr, EP_IntValue) );
      zId = pExpr->u.zToken;
      pDef = sqlite3FindFunction(db, zId, nFarg, enc, 0);
#ifdef SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION
      if( pDef==0 && pParse->explain ){
        pDef = sqlite3FindFunction(db, "unknown", nFarg, enc, 0);
................................................................................
  }
  sqlite3ReleaseTempReg(pParse, regFree1);
  sqlite3ReleaseTempReg(pParse, regFree2);
  return inReg;
}

/*
** Generate code that will evaluate expression pExpr just one time
** per prepared statement execution.
**
** If the expression uses functions (that might throw an exception) then
** guard them with an OP_Once opcode to ensure that the code is only executed
** once. If no functions are involved, then factor the code out and put it at
** the end of the prepared statement in the initialization section.
**
** If regDest>=0 then the result is always stored in that register and the
** result is not reusable.  If regDest<0 then this routine is free to 
** store the value whereever it wants.  The register where the expression 
** is stored is returned.  When regDest<0, two identical expressions might
** code to the same register, if they do not contain function calls and hence
** are factored out into the initialization section at the end of the
** prepared statement.
*/
SQLITE_PRIVATE int sqlite3ExprCodeRunJustOnce(
  Parse *pParse,    /* Parsing context */
  Expr *pExpr,      /* The expression to code when the VDBE initializes */
  int regDest       /* Store the value in this register */
){
  ExprList *p;
  assert( ConstFactorOk(pParse) );
  p = pParse->pConstExpr;
................................................................................
    for(pItem=p->a, i=p->nExpr; i>0; pItem++, i--){
      if( pItem->reusable && sqlite3ExprCompare(0,pItem->pExpr,pExpr,-1)==0 ){
        return pItem->u.iConstExprReg;
      }
    }
  }
  pExpr = sqlite3ExprDup(pParse->db, pExpr, 0);
  if( pExpr!=0 && ExprHasProperty(pExpr, EP_HasFunc) ){
    Vdbe *v = pParse->pVdbe;
    int addr;
    assert( v );
    addr = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
    pParse->okConstFactor = 0;
    if( !pParse->db->mallocFailed ){
      if( regDest<0 ) regDest = ++pParse->nMem;
      sqlite3ExprCode(pParse, pExpr, regDest);
    }
    pParse->okConstFactor = 1;
    sqlite3ExprDelete(pParse->db, pExpr);
    sqlite3VdbeJumpHere(v, addr);
  }else{
    p = sqlite3ExprListAppend(pParse, p, pExpr);
    if( p ){
       struct ExprList_item *pItem = &p->a[p->nExpr-1];
       pItem->reusable = regDest<0;
       if( regDest<0 ) regDest = ++pParse->nMem;
       pItem->u.iConstExprReg = regDest;
    }
    pParse->pConstExpr = p;
  }
  return regDest;
}

/*
** Generate code to evaluate an expression and store the results
** into a register.  Return the register number where the results
** are stored.
................................................................................
  int r2;
  pExpr = sqlite3ExprSkipCollateAndLikely(pExpr);
  if( ConstFactorOk(pParse)
   && pExpr->op!=TK_REGISTER
   && sqlite3ExprIsConstantNotJoin(pExpr)
  ){
    *pReg  = 0;
    r2 = sqlite3ExprCodeRunJustOnce(pParse, pExpr, -1);
  }else{
    int r1 = sqlite3GetTempReg(pParse);
    r2 = sqlite3ExprCodeTarget(pParse, pExpr, r1);
    if( r2==r1 ){
      *pReg = r1;
    }else{
      sqlite3ReleaseTempReg(pParse, r1);
................................................................................
** Generate code that will evaluate expression pExpr and store the
** results in register target.  The results are guaranteed to appear
** in register target.
*/
SQLITE_PRIVATE void sqlite3ExprCode(Parse *pParse, Expr *pExpr, int target){
  int inReg;

  assert( pExpr==0 || !ExprHasVVAProperty(pExpr,EP_Immutable) );
  assert( target>0 && target<=pParse->nMem );
  inReg = sqlite3ExprCodeTarget(pParse, pExpr, target);
  assert( pParse->pVdbe!=0 || pParse->db->mallocFailed );
  if( inReg!=target && pParse->pVdbe ){
    u8 op;
    if( ExprHasProperty(pExpr,EP_Subquery) ){
      op = OP_Copy;
................................................................................
** Generate code that will evaluate expression pExpr and store the
** results in register target.  The results are guaranteed to appear
** in register target.  If the expression is constant, then this routine
** might choose to code the expression at initialization time.
*/
SQLITE_PRIVATE void sqlite3ExprCodeFactorable(Parse *pParse, Expr *pExpr, int target){
  if( pParse->okConstFactor && sqlite3ExprIsConstantNotJoin(pExpr) ){
    sqlite3ExprCodeRunJustOnce(pParse, pExpr, target);
  }else{
    sqlite3ExprCodeCopy(pParse, pExpr, target);
  }
}

/*
** Generate code that pushes the value of every element of the given
** expression list into a sequence of registers beginning at target.
**
................................................................................
        n--;
      }else{
        sqlite3VdbeAddOp2(v, copyOp, j+srcReg-1, target+i);
      }
    }else if( (flags & SQLITE_ECEL_FACTOR)!=0
           && sqlite3ExprIsConstantNotJoin(pExpr)
    ){
      sqlite3ExprCodeRunJustOnce(pParse, pExpr, target+i);
    }else{
      int inReg = sqlite3ExprCodeTarget(pParse, pExpr, target+i);
      if( inReg!=target+i ){
        VdbeOp *pOp;
        if( copyOp==OP_Copy
         && (pOp=sqlite3VdbeGetOp(v, -1))->opcode==OP_Copy
         && pOp->p1+pOp->p3+1==inReg
................................................................................
  int regFree1 = 0;
  int regFree2 = 0;
  int r1, r2;

  assert( jumpIfNull==SQLITE_JUMPIFNULL || jumpIfNull==0 );
  if( NEVER(v==0) )     return;  /* Existence of VDBE checked by caller */
  if( NEVER(pExpr==0) ) return;  /* No way this can happen */
  assert( !ExprHasVVAProperty(pExpr, EP_Immutable) );
  op = pExpr->op;
  switch( op ){
    case TK_AND:
    case TK_OR: {
      Expr *pAlt = sqlite3ExprSimplifiedAndOr(pExpr);
      if( pAlt!=pExpr ){
        sqlite3ExprIfTrue(pParse, pAlt, dest, jumpIfNull);
................................................................................
  int regFree1 = 0;
  int regFree2 = 0;
  int r1, r2;

  assert( jumpIfNull==SQLITE_JUMPIFNULL || jumpIfNull==0 );
  if( NEVER(v==0) ) return; /* Existence of VDBE checked by caller */
  if( pExpr==0 )    return;
  assert( !ExprHasVVAProperty(pExpr,EP_Immutable) );

  /* The value of pExpr->op and op are related as follows:
  **
  **       pExpr->op            op
  **       ---------          ----------
  **       TK_ISNULL          OP_NotNull
  **       TK_NOTNULL         OP_IsNull
................................................................................
      if( sqlite3_stricmp(pA->u.zToken,pB->u.zToken)!=0 ) return 2;
    }else if( ALWAYS(pB->u.zToken!=0) && strcmp(pA->u.zToken,pB->u.zToken)!=0 ){
      return 2;
    }
  }
  if( (pA->flags & (EP_Distinct|EP_Commuted))
     != (pB->flags & (EP_Distinct|EP_Commuted)) ) return 2;
  if( ALWAYS((combinedFlags & EP_TokenOnly)==0) ){
    if( combinedFlags & EP_xIsSelect ) return 2;
    if( (combinedFlags & EP_FixedCol)==0
     && sqlite3ExprCompare(pParse, pA->pLeft, pB->pLeft, iTab) ) return 2;
    if( sqlite3ExprCompare(pParse, pA->pRight, pB->pRight, iTab) ) return 2;
    if( sqlite3ExprListCompare(pA->x.pList, pB->x.pList, iTab) ) return 2;
    if( pA->op!=TK_STRING
     && pA->op!=TK_TRUEFALSE
     && ALWAYS((combinedFlags & EP_Reduced)==0)
    ){
      if( pA->iColumn!=pB->iColumn ) return 2;
      if( pA->op2!=pB->op2 && pA->op==TK_TRUTH ) return 2;














      if( pA->op!=TK_IN && pA->iTable!=pB->iTable && pA->iTable!=iTab ){
        return 2;
      }
    }
  }
  return 0;
}
................................................................................
#endif

/*
** Three SQL functions - stat_init(), stat_push(), and stat_get() -
** share an instance of the following structure to hold their state
** information.
*/
typedef struct StatAccum StatAccum;
typedef struct StatSample StatSample;
struct StatSample {
  tRowcnt *anEq;                  /* sqlite_stat4.nEq */
  tRowcnt *anDLt;                 /* sqlite_stat4.nDLt */
#ifdef SQLITE_ENABLE_STAT4
  tRowcnt *anLt;                  /* sqlite_stat4.nLt */
  union {
    i64 iRowid;                     /* Rowid in main table of the key */
    u8 *aRowid;                     /* Key for WITHOUT ROWID tables */
................................................................................
  } u;
  u32 nRowid;                     /* Sizeof aRowid[] */
  u8 isPSample;                   /* True if a periodic sample */
  int iCol;                       /* If !isPSample, the reason for inclusion */
  u32 iHash;                      /* Tiebreaker hash */
#endif
};                                                    
struct StatAccum {
  sqlite3 *db;              /* Database connection, for malloc() */
  tRowcnt nRow;             /* Number of rows in the entire table */

  int nCol;                 /* Number of columns in index + pk/rowid */
  int nKeyCol;              /* Number of index columns w/o the pk/rowid */
  StatSample current;       /* Current row as a StatSample */
#ifdef SQLITE_ENABLE_STAT4
  tRowcnt nPSample;         /* How often to do a periodic sample */
  int mxSample;             /* Maximum number of samples to accumulate */

  u32 iPrn;                 /* Pseudo-random number used for sampling */
  StatSample *aBest;        /* Array of nCol best samples */
  int iMin;                 /* Index in a[] of entry with minimum score */
  int nSample;              /* Current number of samples */
  int nMaxEqZero;           /* Max leading 0 in anEq[] for any a[] entry */
  int iGet;                 /* Index of current sample accessed by stat_get() */
  StatSample *a;            /* Array of mxSample StatSample objects */
#endif
};

/* Reclaim memory used by a StatSample
*/
#ifdef SQLITE_ENABLE_STAT4
static void sampleClear(sqlite3 *db, StatSample *p){
  assert( db!=0 );
  if( p->nRowid ){
    sqlite3DbFree(db, p->u.aRowid);
    p->nRowid = 0;
  }
}
#endif

/* Initialize the BLOB value of a ROWID
*/
#ifdef SQLITE_ENABLE_STAT4
static void sampleSetRowid(sqlite3 *db, StatSample *p, int n, const u8 *pData){
  assert( db!=0 );
  if( p->nRowid ) sqlite3DbFree(db, p->u.aRowid);
  p->u.aRowid = sqlite3DbMallocRawNN(db, n);
  if( p->u.aRowid ){
    p->nRowid = n;
    memcpy(p->u.aRowid, pData, n);
  }else{
................................................................................
  }
}
#endif

/* Initialize the INTEGER value of a ROWID.
*/
#ifdef SQLITE_ENABLE_STAT4
static void sampleSetRowidInt64(sqlite3 *db, StatSample *p, i64 iRowid){
  assert( db!=0 );
  if( p->nRowid ) sqlite3DbFree(db, p->u.aRowid);
  p->nRowid = 0;
  p->u.iRowid = iRowid;
}
#endif


/*
** Copy the contents of object (*pFrom) into (*pTo).
*/
#ifdef SQLITE_ENABLE_STAT4
static void sampleCopy(StatAccum *p, StatSample *pTo, StatSample *pFrom){
  pTo->isPSample = pFrom->isPSample;
  pTo->iCol = pFrom->iCol;
  pTo->iHash = pFrom->iHash;
  memcpy(pTo->anEq, pFrom->anEq, sizeof(tRowcnt)*p->nCol);
  memcpy(pTo->anLt, pFrom->anLt, sizeof(tRowcnt)*p->nCol);
  memcpy(pTo->anDLt, pFrom->anDLt, sizeof(tRowcnt)*p->nCol);
  if( pFrom->nRowid ){
................................................................................
  }else{
    sampleSetRowidInt64(p->db, pTo, pFrom->u.iRowid);
  }
}
#endif

/*
** Reclaim all memory of a StatAccum structure.
*/
static void statAccumDestructor(void *pOld){
  StatAccum *p = (StatAccum*)pOld;
#ifdef SQLITE_ENABLE_STAT4
  int i;
  for(i=0; i<p->nCol; i++) sampleClear(p->db, p->aBest+i);
  for(i=0; i<p->mxSample; i++) sampleClear(p->db, p->a+i);
  sampleClear(p->db, &p->current);
#endif
  sqlite3DbFree(p->db, p);
................................................................................
** Note 2:  C is only used for STAT4.
**
** For indexes on ordinary rowid tables, N==K+1.  But for indexes on
** WITHOUT ROWID tables, N=K+P where P is the number of columns in the
** PRIMARY KEY of the table.  The covering index that implements the
** original WITHOUT ROWID table as N==K as a special case.
**
** This routine allocates the StatAccum object in heap memory. The return 
** value is a pointer to the StatAccum object.  The datatype of the
** return value is BLOB, but it is really just a pointer to the StatAccum
** object.
*/
static void statInit(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  StatAccum *p;
  int nCol;                       /* Number of columns in index being sampled */
  int nKeyCol;                    /* Number of key columns */
  int nColUp;                     /* nCol rounded up for alignment */
  int n;                          /* Bytes of space to allocate */
  sqlite3 *db;                    /* Database connection */
#ifdef SQLITE_ENABLE_STAT4
  int mxSample = SQLITE_STAT4_SAMPLES;
................................................................................
  nCol = sqlite3_value_int(argv[0]);
  assert( nCol>0 );
  nColUp = sizeof(tRowcnt)<8 ? (nCol+1)&~1 : nCol;
  nKeyCol = sqlite3_value_int(argv[1]);
  assert( nKeyCol<=nCol );
  assert( nKeyCol>0 );

  /* Allocate the space required for the StatAccum object */
  n = sizeof(*p) 
    + sizeof(tRowcnt)*nColUp                  /* StatAccum.anEq */
    + sizeof(tRowcnt)*nColUp                  /* StatAccum.anDLt */
#ifdef SQLITE_ENABLE_STAT4
    + sizeof(tRowcnt)*nColUp                  /* StatAccum.anLt */
    + sizeof(StatSample)*(nCol+mxSample)      /* StatAccum.aBest[], a[] */
    + sizeof(tRowcnt)*3*nColUp*(nCol+mxSample)
#endif
  ;
  db = sqlite3_context_db_handle(context);
  p = sqlite3DbMallocZero(db, n);
  if( p==0 ){
    sqlite3_result_error_nomem(context);
................................................................................

    p->iGet = -1;
    p->mxSample = mxSample;
    p->nPSample = (tRowcnt)(sqlite3_value_int64(argv[2])/(mxSample/3+1) + 1);
    p->current.anLt = &p->current.anEq[nColUp];
    p->iPrn = 0x689e962d*(u32)nCol ^ 0xd0944565*(u32)sqlite3_value_int(argv[2]);
  
    /* Set up the StatAccum.a[] and aBest[] arrays */
    p->a = (struct StatSample*)&p->current.anLt[nColUp];
    p->aBest = &p->a[mxSample];
    pSpace = (u8*)(&p->a[mxSample+nCol]);
    for(i=0; i<(mxSample+nCol); i++){
      p->a[i].anEq = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nColUp);
      p->a[i].anLt = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nColUp);
      p->a[i].anDLt = (tRowcnt *)pSpace; pSpace += (sizeof(tRowcnt) * nColUp);
    }
................................................................................
  }
#endif

  /* Return a pointer to the allocated object to the caller.  Note that
  ** only the pointer (the 2nd parameter) matters.  The size of the object
  ** (given by the 3rd parameter) is never used and can be any positive
  ** value. */
  sqlite3_result_blob(context, p, sizeof(*p), statAccumDestructor);
}
static const FuncDef statInitFuncdef = {
  2+IsStat4,       /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statInit,        /* xSFunc */
................................................................................
** In other words, if we assume that the cardinalities of the selected
** column for pNew and pOld are equal, is pNew to be preferred over pOld.
**
** This function assumes that for each argument sample, the contents of
** the anEq[] array from pSample->anEq[pSample->iCol+1] onwards are valid. 
*/
static int sampleIsBetterPost(
  StatAccum *pAccum, 
  StatSample *pNew, 
  StatSample *pOld
){
  int nCol = pAccum->nCol;
  int i;
  assert( pNew->iCol==pOld->iCol );
  for(i=pNew->iCol+1; i<nCol; i++){
    if( pNew->anEq[i]>pOld->anEq[i] ) return 1;
    if( pNew->anEq[i]<pOld->anEq[i] ) return 0;
................................................................................
/*
** Return true if pNew is to be preferred over pOld.
**
** This function assumes that for each argument sample, the contents of
** the anEq[] array from pSample->anEq[pSample->iCol] onwards are valid. 
*/
static int sampleIsBetter(
  StatAccum *pAccum, 
  StatSample *pNew, 
  StatSample *pOld
){
  tRowcnt nEqNew = pNew->anEq[pNew->iCol];
  tRowcnt nEqOld = pOld->anEq[pOld->iCol];

  assert( pOld->isPSample==0 && pNew->isPSample==0 );
  assert( IsStat4 || (pNew->iCol==0 && pOld->iCol==0) );

................................................................................
  return 0;
}

/*
** Copy the contents of sample *pNew into the p->a[] array. If necessary,
** remove the least desirable sample from p->a[] to make room.
*/
static void sampleInsert(StatAccum *p, StatSample *pNew, int nEqZero){
  StatSample *pSample = 0;
  int i;

  assert( IsStat4 || nEqZero==0 );

  /* StatAccum.nMaxEqZero is set to the maximum number of leading 0
  ** values in the anEq[] array of any sample in StatAccum.a[]. In
  ** other words, if nMaxEqZero is n, then it is guaranteed that there
  ** are no samples with StatSample.anEq[m]==0 for (m>=n). */
  if( nEqZero>p->nMaxEqZero ){
    p->nMaxEqZero = nEqZero;
  }
  if( pNew->isPSample==0 ){
    StatSample *pUpgrade = 0;
    assert( pNew->anEq[pNew->iCol]>0 );

    /* This sample is being added because the prefix that ends in column 
    ** iCol occurs many times in the table. However, if we have already
    ** added a sample that shares this prefix, there is no need to add
    ** this one. Instead, upgrade the priority of the highest priority
    ** existing sample that shares this prefix.  */
    for(i=p->nSample-1; i>=0; i--){
      StatSample *pOld = &p->a[i];
      if( pOld->anEq[pNew->iCol]==0 ){
        if( pOld->isPSample ) return;
        assert( pOld->iCol>pNew->iCol );
        assert( sampleIsBetter(p, pNew, pOld) );
        if( pUpgrade==0 || sampleIsBetter(p, pOld, pUpgrade) ){
          pUpgrade = pOld;
        }
................................................................................
      pUpgrade->anEq[pUpgrade->iCol] = pNew->anEq[pUpgrade->iCol];
      goto find_new_min;
    }
  }

  /* If necessary, remove sample iMin to make room for the new sample. */
  if( p->nSample>=p->mxSample ){
    StatSample *pMin = &p->a[p->iMin];
    tRowcnt *anEq = pMin->anEq;
    tRowcnt *anLt = pMin->anLt;
    tRowcnt *anDLt = pMin->anDLt;
    sampleClear(p->db, pMin);
    memmove(pMin, &pMin[1], sizeof(p->a[0])*(p->nSample-p->iMin-1));
    pSample = &p->a[p->nSample-1];
    pSample->nRowid = 0;
................................................................................
    }
    assert( iMin>=0 );
    p->iMin = iMin;
  }
}
#endif /* SQLITE_ENABLE_STAT4 */

#ifdef SQLITE_ENABLE_STAT4
/*
** Field iChng of the index being scanned has changed. So at this point
** p->current contains a sample that reflects the previous row of the
** index. The value of anEq[iChng] and subsequent anEq[] elements are
** correct at this point.
*/
static void samplePushPrevious(StatAccum *p, int iChng){

  int i;

  /* Check if any samples from the aBest[] array should be pushed
  ** into IndexSample.a[] at this point.  */
  for(i=(p->nCol-2); i>=iChng; i--){
    StatSample *pBest = &p->aBest[i];
    pBest->anEq[i] = p->current.anEq[i];
    if( p->nSample<p->mxSample || sampleIsBetter(p, pBest, &p->a[p->iMin]) ){
      sampleInsert(p, pBest, i);
    }
  }

  /* Check that no sample contains an anEq[] entry with an index of
................................................................................
      int j;
      for(j=iChng; j<p->nCol; j++){
        if( p->a[i].anEq[j]==0 ) p->a[i].anEq[j] = p->current.anEq[j];
      }
    }
    p->nMaxEqZero = iChng;
  }

}
#endif /* SQLITE_ENABLE_STAT4 */





/*
** Implementation of the stat_push SQL function:  stat_push(P,C,R)
** Arguments:
**
**    P     Pointer to the StatAccum object created by stat_init()
**    C     Index of left-most column to differ from previous row
**    R     Rowid for the current row.  Might be a key record for
**          WITHOUT ROWID tables.
**
** This SQL function always returns NULL.  It's purpose it to accumulate
** statistical data and/or samples in the StatAccum object about the
** index being analyzed.  The stat_get() SQL function will later be used to
** extract relevant information for constructing the sqlite_statN tables.
**
** The R parameter is only used for STAT4
*/
static void statPush(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  int i;

  /* The three function arguments */
  StatAccum *p = (StatAccum*)sqlite3_value_blob(argv[0]);
  int iChng = sqlite3_value_int(argv[1]);

  UNUSED_PARAMETER( argc );
  UNUSED_PARAMETER( context );
  assert( p->nCol>0 );
  assert( iChng<p->nCol );

  if( p->nRow==0 ){
    /* This is the first call to this function. Do initialization. */
    for(i=0; i<p->nCol; i++) p->current.anEq[i] = 1;
  }else{
    /* Second and subsequent calls get processed here */
#ifdef SQLITE_ENABLE_STAT4
    samplePushPrevious(p, iChng);
#endif

    /* Update anDLt[], anLt[] and anEq[] to reflect the values that apply
    ** to the current row of the index. */
    for(i=0; i<iChng; i++){
      p->current.anEq[i]++;
    }
    for(i=iChng; i<p->nCol; i++){
................................................................................
#define STAT_GET_NEQ   2          /* "neq" column of stat[34] entry */
#define STAT_GET_NLT   3          /* "nlt" column of stat[34] entry */
#define STAT_GET_NDLT  4          /* "ndlt" column of stat[34] entry */

/*
** Implementation of the stat_get(P,J) SQL function.  This routine is
** used to query statistical information that has been gathered into
** the StatAccum object by prior calls to stat_push().  The P parameter
** has type BLOB but it is really just a pointer to the StatAccum object.
** The content to returned is determined by the parameter J
** which is one of the STAT_GET_xxxx values defined above.
**
** The stat_get(P,J) function is not available to generic SQL.  It is
** inserted as part of a manually constructed bytecode program.  (See
** the callStatGet() routine below.)  It is guaranteed that the P
** parameter will always be a pointer to a StatAccum object, never a
** NULL.
**
** If STAT4 is not enabled, then J is always
** STAT_GET_STAT1 and is hence omitted and this routine becomes
** a one-parameter function, stat_get(P), that always returns the
** stat1 table entry information.
*/
static void statGet(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  StatAccum *p = (StatAccum*)sqlite3_value_blob(argv[0]);
#ifdef SQLITE_ENABLE_STAT4
  /* STAT4 has a parameter on this routine. */
  int eCall = sqlite3_value_int(argv[1]);
  assert( argc==2 );
  assert( eCall==STAT_GET_STAT1 || eCall==STAT_GET_NEQ 
       || eCall==STAT_GET_ROWID || eCall==STAT_GET_NLT
       || eCall==STAT_GET_NDLT 
................................................................................
    /* Return the value to store in the "stat" column of the sqlite_stat1
    ** table for this index.
    **
    ** The value is a string composed of a list of integers describing 
    ** the index. The first integer in the list is the total number of 
    ** entries in the index. There is one additional integer in the list 
    ** for each indexed column. This additional integer is an estimate of
    ** the number of rows matched by a equality query on the index using
    ** a key with the corresponding number of fields. In other words,
    ** if the index is on columns (a,b) and the sqlite_stat1 value is 
    ** "100 10 2", then SQLite estimates that:
    **
    **   * the index contains 100 rows,
    **   * "WHERE a=?" matches 10 rows, and
    **   * "WHERE a=? AND b=?" matches 2 rows.
................................................................................
#ifdef SQLITE_ENABLE_STAT4
  else if( eCall==STAT_GET_ROWID ){
    if( p->iGet<0 ){
      samplePushPrevious(p, 0);
      p->iGet = 0;
    }
    if( p->iGet<p->nSample ){
      StatSample *pS = p->a + p->iGet;
      if( pS->nRowid==0 ){
        sqlite3_result_int64(context, pS->u.iRowid);
      }else{
        sqlite3_result_blob(context, pS->u.aRowid, pS->nRowid,
                            SQLITE_TRANSIENT);
      }
    }
................................................................................
  int iTabCur;                 /* Table cursor */
  Vdbe *v;                     /* The virtual machine being built up */
  int i;                       /* Loop counter */
  int jZeroRows = -1;          /* Jump from here if number of rows is zero */
  int iDb;                     /* Index of database containing pTab */
  u8 needTableCnt = 1;         /* True to count the table */
  int regNewRowid = iMem++;    /* Rowid for the inserted record */
  int regStat4 = iMem++;       /* Register to hold StatAccum object */
  int regChng = iMem++;        /* Index of changed index field */
#ifdef SQLITE_ENABLE_STAT4
  int regRowid = iMem++;       /* Rowid argument passed to stat_push() */
#endif
  int regTemp = iMem++;        /* Temporary use register */
  int regTabname = iMem++;     /* Register containing table name */
  int regIdxname = iMem++;     /* Register containing index name */
................................................................................
      rc = sqlite3ResolveExprNames(pName, pExpr);
    }else{
      pExpr->op = TK_STRING;
    }
  }
  return rc;
}

/*
** Return true if zName points to a name that may be used to refer to
** database iDb attached to handle db.
*/
SQLITE_PRIVATE int sqlite3DbIsNamed(sqlite3 *db, int iDb, const char *zName){
  return (
      sqlite3StrICmp(db->aDb[iDb].zDbSName, zName)==0
   || (iDb==0 && sqlite3StrICmp("main", zName)==0)
  );
}

/*
** An SQL user-function registered to do the work of an ATTACH statement. The
** three arguments to the function come directly from an attach statement:
**
**     ATTACH DATABASE x AS y KEY z
**
................................................................................
    if( db->nDb>=db->aLimit[SQLITE_LIMIT_ATTACHED]+2 ){
      zErrDyn = sqlite3MPrintf(db, "too many attached databases - max %d", 
        db->aLimit[SQLITE_LIMIT_ATTACHED]
      );
      goto attach_error;
    }
    for(i=0; i<db->nDb; i++){
      assert( zName );
      if( sqlite3DbIsNamed(db, i, zName) ){

        zErrDyn = sqlite3MPrintf(db, "database %s is already in use", zName);
        goto attach_error;
      }
    }
  
    /* Allocate the new entry in the db->aDb[] array and initialize the schema
    ** hash tables.
................................................................................

  UNUSED_PARAMETER(NotUsed);

  if( zName==0 ) zName = "";
  for(i=0; i<db->nDb; i++){
    pDb = &db->aDb[i];
    if( pDb->pBt==0 ) continue;
    if( sqlite3DbIsNamed(db, i, zName) ) break;
  }

  if( i>=db->nDb ){
    sqlite3_snprintf(sizeof(zErr),zErr, "no such database: %s", zName);
    goto detach_error;
  }
  if( i<2 ){
................................................................................
** checks out, these routines return 0.
*/
SQLITE_PRIVATE int sqlite3FixSrcList(
  DbFixer *pFix,       /* Context of the fixation */
  SrcList *pList       /* The Source list to check and modify */
){
  int i;

  struct SrcList_item *pItem;
  sqlite3 *db = pFix->pParse->db;
  int iDb = sqlite3FindDbName(db, pFix->zDb);

  if( NEVER(pList==0) ) return 0;


  for(i=0, pItem=pList->a; i<pList->nSrc; i++, pItem++){
    if( pFix->bTemp==0 ){

      if( pItem->zDatabase && iDb!=sqlite3FindDbName(db, pItem->zDatabase) ){
        sqlite3ErrorMsg(pFix->pParse,
            "%s %T cannot reference objects in database %s",
            pFix->zType, pFix->pName, pItem->zDatabase);
        return 1;
      }
      sqlite3DbFree(db, pItem->zDatabase);
      pItem->zDatabase = 0;
      pItem->pSchema = pFix->pSchema;
      pItem->fg.fromDDL = 1;
    }
#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_TRIGGER)
    if( sqlite3FixSelect(pFix, pItem->pSelect) ) return 1;
    if( sqlite3FixExpr(pFix, pItem->pOn) ) return 1;
................................................................................
  if( db->auth.authLevel<UAUTH_Admin && sqlite3UserAuthTable(zName)!=0 ){
    return 0;
  }
#endif
  while(1){
    for(i=OMIT_TEMPDB; i<db->nDb; i++){
      int j = (i<2) ? i^1 : i;   /* Search TEMP before MAIN */
      if( zDatabase==0 || sqlite3DbIsNamed(db, j, zDatabase) ){
        assert( sqlite3SchemaMutexHeld(db, j, 0) );
        p = sqlite3HashFind(&db->aDb[j].pSchema->tblHash, zName);
        if( p ) return p;
      }
    }
    /* Not found.  If the name we were looking for was temp.sqlite_master
    ** then change the name to sqlite_temp_master and try again. */
................................................................................
  int i;
  /* All mutexes are required for schema access.  Make sure we hold them. */
  assert( zDb!=0 || sqlite3BtreeHoldsAllMutexes(db) );
  for(i=OMIT_TEMPDB; i<db->nDb; i++){
    int j = (i<2) ? i^1 : i;  /* Search TEMP before MAIN */
    Schema *pSchema = db->aDb[j].pSchema;
    assert( pSchema );
    if( zDb && sqlite3DbIsNamed(db, j, zDb)==0 ) continue;
    assert( sqlite3SchemaMutexHeld(db, j, 0) );
    p = sqlite3HashFind(&pSchema->idxHash, zName);
    if( p ) break;
  }
  return p;
}

................................................................................
  pMod = (Module*)sqlite3HashFind(&db->aModule, pTab->azModuleArg[0]);
  if( pMod==0 ) return 0;
  if( pMod->pModule->iVersion<3 ) return 0;
  if( pMod->pModule->xShadowName==0 ) return 0;
  return pMod->pModule->xShadowName(zTail+1);
}
#endif /* ifndef SQLITE_OMIT_VIRTUALTABLE */

#ifdef SQLITE_DEBUG
/*
** Mark all nodes of an expression as EP_Immutable, indicating that
** they should not be changed.  Expressions attached to a table or
** index definition are tagged this way to help ensure that we do
** not pass them into code generator routines by mistake.
*/
static int markImmutableExprStep(Walker *pWalker, Expr *pExpr){
  ExprSetVVAProperty(pExpr, EP_Immutable);
  return WRC_Continue;
}
static void markExprListImmutable(ExprList *pList){
  if( pList ){
    Walker w;
    memset(&w, 0, sizeof(w));
    w.xExprCallback = markImmutableExprStep;
    w.xSelectCallback = sqlite3SelectWalkNoop;
    w.xSelectCallback2 = 0;
    sqlite3WalkExprList(&w, pList);
  }
}
#else
#define markExprListImmutable(X)  /* no-op */
#endif /* SQLITE_DEBUG */


/*
** This routine is called to report the final ")" that terminates
** a CREATE TABLE statement.
**
** The table structure that other action routines have been building
** is added to the internal hash tables, assuming no errors have
................................................................................
  if( p->pCheck ){
    sqlite3ResolveSelfReference(pParse, p, NC_IsCheck, 0, p->pCheck);
    if( pParse->nErr ){
      /* If errors are seen, delete the CHECK constraints now, else they might
      ** actually be used if PRAGMA writable_schema=ON is set. */
      sqlite3ExprListDelete(db, p->pCheck);
      p->pCheck = 0;
    }else{
      markExprListImmutable(p->pCheck);
    }
  }
#endif /* !defined(SQLITE_OMIT_CHECK) */
#ifndef SQLITE_OMIT_GENERATED_COLUMNS
  if( p->tabFlags & TF_HasGenerated ){
    int ii, nNG = 0;
    testcase( p->tabFlags & TF_HasVirtual );
................................................................................
SQLITE_PRIVATE CollSeq *sqlite3FindCollSeq(
  sqlite3 *db,          /* Database connection to search */
  u8 enc,               /* Desired text encoding */
  const char *zName,    /* Name of the collating sequence.  Might be NULL */
  int create            /* True to create CollSeq if doesn't already exist */
){
  CollSeq *pColl;
  assert( SQLITE_UTF8==1 && SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 );
  assert( enc>=SQLITE_UTF8 && enc<=SQLITE_UTF16BE );
  if( zName ){
    pColl = findCollSeqEntry(db, zName, create);
    if( pColl ) pColl += enc-1;
  }else{
    pColl = db->pDfltColl;
  }



  return pColl;
}

/*
** Change the text encoding for a database connection. This means that
** the pDfltColl must change as well.
*/
SQLITE_PRIVATE void sqlite3SetTextEncoding(sqlite3 *db, u8 enc){
  assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
  db->enc = enc;
  /* EVIDENCE-OF: R-08308-17224 The default collating function for all
  ** strings is BINARY. 
  */
  db->pDfltColl = sqlite3FindCollSeq(db, enc, sqlite3StrBINARY, 0);
}

/*
** This function is responsible for invoking the collation factory callback
** or substituting a collation sequence of a different encoding when the
** requested collation sequence is not available in the desired encoding.
** 
** If it is not NULL, then pColl must point to the database native encoding 
................................................................................
  sqlite3_value **argv
){
  const unsigned char *zA, *zB;
  u32 escape;
  int nPat;
  sqlite3 *db = sqlite3_context_db_handle(context);
  struct compareInfo *pInfo = sqlite3_user_data(context);
  struct compareInfo backupInfo;

#ifdef SQLITE_LIKE_DOESNT_MATCH_BLOBS
  if( sqlite3_value_type(argv[0])==SQLITE_BLOB
   || sqlite3_value_type(argv[1])==SQLITE_BLOB
  ){
#ifdef SQLITE_TEST
    sqlite3_like_count++;
................................................................................
    if( zEsc==0 ) return;
    if( sqlite3Utf8CharLen((char*)zEsc, -1)!=1 ){
      sqlite3_result_error(context, 
          "ESCAPE expression must be a single character", -1);
      return;
    }
    escape = sqlite3Utf8Read(&zEsc);
    if( escape==pInfo->matchAll || escape==pInfo->matchOne ){
      memcpy(&backupInfo, pInfo, sizeof(backupInfo));
      pInfo = &backupInfo;
      if( escape==pInfo->matchAll ) pInfo->matchAll = 0;
      if( escape==pInfo->matchOne ) pInfo->matchOne = 0;
    }
  }else{
    escape = pInfo->matchSet;
  }
  zB = sqlite3_value_text(argv[0]);
  zA = sqlite3_value_text(argv[1]);
  if( zA && zB ){
#ifdef SQLITE_TEST
................................................................................
  pDef = sqlite3FindFunction(db, pExpr->u.zToken, nExpr, SQLITE_UTF8, 0);
#ifdef SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION
  if( pDef==0 ) return 0;
#endif
  if( NEVER(pDef==0) || (pDef->funcFlags & SQLITE_FUNC_LIKE)==0 ){
    return 0;
  }











  /* The memcpy() statement assumes that the wildcard characters are
  ** the first three statements in the compareInfo structure.  The
  ** asserts() that follow verify that assumption
  */
  memcpy(aWc, pDef->pUserData, 3);
  assert( (char*)&likeInfoAlt == (char*)&likeInfoAlt.matchAll );
  assert( &((char*)&likeInfoAlt)[1] == (char*)&likeInfoAlt.matchOne );
  assert( &((char*)&likeInfoAlt)[2] == (char*)&likeInfoAlt.matchSet );

  if( nExpr<3 ){
    aWc[3] = 0;
  }else{
    Expr *pEscape = pExpr->x.pList->a[2].pExpr;
    char *zEscape;
    if( pEscape->op!=TK_STRING ) return 0;
    zEscape = pEscape->u.zToken;
    if( zEscape[0]==0 || zEscape[1]!=0 ) return 0;
    if( zEscape[0]==aWc[0] ) return 0;
    if( zEscape[0]==aWc[1] ) return 0;
    aWc[3] = zEscape[0];
  }

  *pIsNocase = (pDef->funcFlags & SQLITE_FUNC_CASE)==0;
  return 1;
}

/*
** All of the FuncDef structures in the aBuiltinFunc[] array above
** to the global function hash table.  This occurs at start-time (as
................................................................................
        iReg = sqlite3TableColumnToStorage(pTab, i) + regNewData + 1;
        switch( onError ){
          case OE_Replace: {
            int addr1 = sqlite3VdbeAddOp1(v, OP_NotNull, iReg);
            VdbeCoverage(v);
            assert( (pCol->colFlags & COLFLAG_GENERATED)==0 );
            nSeenReplace++;
            sqlite3ExprCodeCopy(pParse, pCol->pDflt, iReg);
            sqlite3VdbeJumpHere(v, addr1);
            break;
          }
          case OE_Abort:
            sqlite3MayAbort(pParse);
            /* Fall through */
          case OE_Rollback:
................................................................................
#ifndef SQLITE_OMIT_CHECK
  if( pTab->pCheck && (db->flags & SQLITE_IgnoreChecks)==0 ){
    ExprList *pCheck = pTab->pCheck;
    pParse->iSelfTab = -(regNewData+1);
    onError = overrideError!=OE_Default ? overrideError : OE_Abort;
    for(i=0; i<pCheck->nExpr; i++){
      int allOk;
      Expr *pCopy;
      Expr *pExpr = pCheck->a[i].pExpr;
      if( aiChng
       && !sqlite3ExprReferencesUpdatedColumn(pExpr, aiChng, pkChng)
      ){
        /* The check constraints do not reference any of the columns being
        ** updated so there is no point it verifying the check constraint */
        continue;
................................................................................
      }
      if( bAffinityDone==0 ){
        sqlite3TableAffinity(v, pTab, regNewData+1);
        bAffinityDone = 1;
      }
      allOk = sqlite3VdbeMakeLabel(pParse);
      sqlite3VdbeVerifyAbortable(v, onError);
      pCopy = sqlite3ExprDup(db, pExpr, 0);
      if( !db->mallocFailed ){
        sqlite3ExprIfTrue(pParse, pCopy, allOk, SQLITE_JUMPIFNULL);
      }
      sqlite3ExprDelete(db, pCopy);
      if( onError==OE_Ignore ){
        sqlite3VdbeGoto(v, ignoreDest);
      }else{
        char *zName = pCheck->a[i].zEName;
        if( zName==0 ) zName = pTab->zName;
        if( onError==OE_Replace ) onError = OE_Abort; /* IMP: R-26383-51744 */
        sqlite3HaltConstraint(pParse, SQLITE_CONSTRAINT_CHECK,
................................................................................
      returnSingleText(v, encnames[ENC(pParse->db)].zName);
    }else{                        /* "PRAGMA encoding = XXX" */
      /* Only change the value of sqlite.enc if the database handle is not
      ** initialized. If the main database exists, the new sqlite.enc value
      ** will be overwritten when the schema is next loaded. If it does not
      ** already exists, it will be created to use the new encoding value.
      */
      if( (db->mDbFlags & DBFLAG_EncodingFixed)==0 ){










        for(pEnc=&encnames[0]; pEnc->zName; pEnc++){
          if( 0==sqlite3StrICmp(zRight, pEnc->zName) ){

            u8 enc = pEnc->enc ? pEnc->enc : SQLITE_UTF16NATIVE;
            SCHEMA_ENC(db) = enc;
            sqlite3SetTextEncoding(db, enc);
            break;
          }
        }
        if( !pEnc->zName ){
          sqlite3ErrorMsg(pParse, "unsupported encoding: %s", zRight);
        }
      }
................................................................................
  InitData *pData = (InitData*)pInit;
  sqlite3 *db = pData->db;
  int iDb = pData->iDb;

  assert( argc==5 );
  UNUSED_PARAMETER2(NotUsed, argc);
  assert( sqlite3_mutex_held(db->mutex) );
  db->mDbFlags |= DBFLAG_EncodingFixed;
  pData->nInitRow++;
  if( db->mallocFailed ){
    corruptSchema(pData, argv[1], 0);
    return 1;
  }

  assert( iDb>=0 && iDb<db->nDb );
................................................................................
#endif
  Db *pDb;
  char const *azArg[6];
  int meta[5];
  InitData initData;
  const char *zMasterName;
  int openedTransaction = 0;
  int mask = ((db->mDbFlags & DBFLAG_EncodingFixed) | ~DBFLAG_EncodingFixed);

  assert( (db->mDbFlags & DBFLAG_SchemaKnownOk)==0 );
  assert( iDb>=0 && iDb<db->nDb );
  assert( db->aDb[iDb].pSchema );
  assert( sqlite3_mutex_held(db->mutex) );
  assert( iDb==1 || sqlite3BtreeHoldsMutex(db->aDb[iDb].pBt) );

................................................................................
  initData.db = db;
  initData.iDb = iDb;
  initData.rc = SQLITE_OK;
  initData.pzErrMsg = pzErrMsg;
  initData.mInitFlags = mFlags;
  initData.nInitRow = 0;
  sqlite3InitCallback(&initData, 5, (char **)azArg, 0);
  db->mDbFlags &= mask;
  if( initData.rc ){
    rc = initData.rc;
    goto error_out;
  }

  /* Create a cursor to hold the database open
  */
................................................................................

  /* If opening a non-empty database, check the text encoding. For the
  ** main database, set sqlite3.enc to the encoding of the main database.
  ** For an attached db, it is an error if the encoding is not the same
  ** as sqlite3.enc.
  */
  if( meta[BTREE_TEXT_ENCODING-1] ){  /* text encoding */
    if( iDb==0 && (db->mDbFlags & DBFLAG_EncodingFixed)==0 ){

      u8 encoding;
#ifndef SQLITE_OMIT_UTF16
      /* If opening the main database, set ENC(db). */
      encoding = (u8)meta[BTREE_TEXT_ENCODING-1] & 3;
      if( encoding==0 ) encoding = SQLITE_UTF8;

#else
      encoding = SQLITE_UTF8;
#endif
      sqlite3SetTextEncoding(db, encoding);
    }else{
      /* If opening an attached database, the encoding much match ENC(db) */
      if( (meta[BTREE_TEXT_ENCODING-1] & 3)!=ENC(db) ){
        sqlite3SetString(pzErrMsg, db, "attached databases must use the same"
            " text encoding as main database");
        rc = SQLITE_ERROR;
        goto initone_error_out;
      }
    }


  }
  pDb->pSchema->enc = ENC(db);

  if( pDb->pSchema->cache_size==0 ){
#ifndef SQLITE_OMIT_DEPRECATED
    size = sqlite3AbsInt32(meta[BTREE_DEFAULT_CACHE_SIZE-1]);
    if( size==0 ){ size = SQLITE_DEFAULT_CACHE_SIZE; }
................................................................................
/*
** Initialize all database files - the main database file, the file
** used to store temporary tables, and any additional database files
** created using ATTACH statements.  Return a success code.  If an
** error occurs, write an error message into *pzErrMsg.
**
** After a database is initialized, the DB_SchemaLoaded bit is set
** bit is set in the flags field of the Db structure. 

*/
SQLITE_PRIVATE int sqlite3Init(sqlite3 *db, char **pzErrMsg){
  int i, rc;
  int commit_internal = !(db->mDbFlags&DBFLAG_SchemaChange);
  
  assert( sqlite3_mutex_held(db->mutex) );
  assert( sqlite3BtreeHoldsMutex(db->aDb[0].pBt) );
................................................................................
    sqlite3ExprDelete(db, p->pHaving);
    sqlite3ExprListDelete(db, p->pOrderBy);
    sqlite3ExprDelete(db, p->pLimit);
#ifndef SQLITE_OMIT_WINDOWFUNC
    if( OK_IF_ALWAYS_TRUE(p->pWinDefn) ){
      sqlite3WindowListDelete(db, p->pWinDefn);
    }

#endif
    if( OK_IF_ALWAYS_TRUE(p->pWith) ) sqlite3WithDelete(db, p->pWith);
    if( bFree ) sqlite3DbFreeNN(db, p);
    p = pPrior;
    bFree = 1;
  }
}
................................................................................
        substExprList(pSubst, pItem->u1.pFuncArg);
      }
    }
  }while( doPrior && (p = p->pPrior)!=0 );
}
#endif /* !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW) */

#if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)
/*
** pSelect is a SELECT statement and pSrcItem is one item in the FROM
** clause of that SELECT.
**
** This routine scans the entire SELECT statement and recomputes the
** pSrcItem->colUsed mask.
*/
static int recomputeColumnsUsedExpr(Walker *pWalker, Expr *pExpr){
  struct SrcList_item *pItem;
  if( pExpr->op!=TK_COLUMN ) return WRC_Continue;
  pItem = pWalker->u.pSrcItem;
  if( pItem->iCursor!=pExpr->iTable ) return WRC_Continue;
  if( pExpr->iColumn<0 ) return WRC_Continue;
  pItem->colUsed |= sqlite3ExprColUsed(pExpr);
  return WRC_Continue;
}
static void recomputeColumnsUsed(
  Select *pSelect,                 /* The complete SELECT statement */
  struct SrcList_item *pSrcItem    /* Which FROM clause item to recompute */
){
  Walker w;
  if( NEVER(pSrcItem->pTab==0) ) return;
  memset(&w, 0, sizeof(w));
  w.xExprCallback = recomputeColumnsUsedExpr;
  w.xSelectCallback = sqlite3SelectWalkNoop;
  w.u.pSrcItem = pSrcItem;
  pSrcItem->colUsed = 0;
  sqlite3WalkSelect(&w, pSelect);
}
#endif /* !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW) */

#if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)
/*
** This routine attempts to flatten subqueries as a performance optimization.
** This routine returns 1 if it makes changes and 0 if no flattening occurs.
**
** To understand the concept of flattening, consider the following
** query:
................................................................................
    ** One is tempted to try to add a and b to combine the limits.  But this
    ** does not work if either limit is negative.
    */
    if( pSub->pLimit ){
      pParent->pLimit = pSub->pLimit;
      pSub->pLimit = 0;
    }

    /* Recompute the SrcList_item.colUsed masks for the flattened
    ** tables. */
    for(i=0; i<nSubSrc; i++){
      recomputeColumnsUsed(pParent, &pSrc->a[i+iFrom]);
    }
  }

  /* Finially, delete what is left of the subquery and return
  ** success.
  */
  sqlite3SelectDelete(db, pSub1);

................................................................................

  assert( pName->nSrc==1 );
  zDb = pName->a[0].zDatabase;
  zName = pName->a[0].zName;
  assert( zDb!=0 || sqlite3BtreeHoldsAllMutexes(db) );
  for(i=OMIT_TEMPDB; i<db->nDb; i++){
    int j = (i<2) ? i^1 : i;  /* Search TEMP before MAIN */
    if( zDb && sqlite3DbIsNamed(db, j, zDb)==0 ) continue;
    assert( sqlite3SchemaMutexHeld(db, j, 0) );
    pTrigger = sqlite3HashFind(&(db->aDb[j].pSchema->trigHash), zName);
    if( pTrigger ) break;
  }
  if( !pTrigger ){
    if( !noErr ){
      sqlite3ErrorMsg(pParse, "no such trigger: %S", pName, 0);
................................................................................
    ){
      assert( bSeekPastNull==0 && nExtraReg==0 && nBtm==0 && nTop==0 );
      assert( pRangeEnd==0 && pRangeStart==0 );
      testcase( pLoop->nSkip>0 );
      nExtraReg = 1;
      bSeekPastNull = 1;
      pLevel->regBignull = regBignull = ++pParse->nMem;
      if( pLevel->iLeftJoin ){
        sqlite3VdbeAddOp2(v, OP_Integer, 0, regBignull);
      }
      pLevel->addrBignull = sqlite3VdbeMakeLabel(pParse);
    }

    /* If we are doing a reverse order scan on an ascending index, or
    ** a forward order scan on a descending index, interchange the 
    ** start and end terms (pRangeStart and pRangeEnd).
    */
................................................................................
        sqlite3VdbeSetP4KeyInfo(pParse, pIx);
        if( (pLoop->wsFlags & WHERE_CONSTRAINT)!=0
         && (pLoop->wsFlags & (WHERE_COLUMN_RANGE|WHERE_SKIPSCAN))==0
         && (pLoop->wsFlags & WHERE_BIGNULL_SORT)==0
         && (pWInfo->wctrlFlags&WHERE_ORDERBY_MIN)==0
         && pWInfo->eDistinct!=WHERE_DISTINCT_ORDERED
        ){
          sqlite3VdbeChangeP5(v, OPFLAG_SEEKEQ);
        }
        VdbeComment((v, "%s", pIx->zName));
#ifdef SQLITE_ENABLE_COLUMN_USED_MASK
        {
          u64 colUsed = 0;
          int ii, jj;
          for(ii=0; ii<pIx->nColumn; ii++){
................................................................................
      int j;
      sqlite3VdbeResolveLabel(v, pLevel->addrNxt);
      for(j=pLevel->u.in.nIn, pIn=&pLevel->u.in.aInLoop[j-1]; j>0; j--, pIn--){
        sqlite3VdbeJumpHere(v, pIn->addrInTop+1);
        if( pIn->eEndLoopOp!=OP_Noop ){
          if( pIn->nPrefix ){
            assert( pLoop->wsFlags & WHERE_IN_EARLYOUT );






            if( pLevel->iLeftJoin ){
              /* For LEFT JOIN queries, cursor pIn->iCur may not have been
              ** opened yet. This occurs for WHERE clauses such as
              ** "a = ? AND b IN (...)", where the index is on (a, b). If
              ** the RHS of the (a=?) is NULL, then the "b IN (...)" may
              ** never have been coded, but the body of the loop run to
              ** return the null-row. So, if the cursor is not open yet,
              ** jump over the OP_Next or OP_Prev instruction about to
              ** be coded.  */
              sqlite3VdbeAddOp2(v, OP_IfNotOpen, pIn->iCur, 
                  sqlite3VdbeCurrentAddr(v) + 2 + 
                     ((pLoop->wsFlags & WHERE_VIRTUALTABLE)==0)
              );
              VdbeCoverage(v);
            }
            if( (pLoop->wsFlags & WHERE_VIRTUALTABLE)==0 ){
              sqlite3VdbeAddOp4Int(v, OP_IfNoHope, pLevel->iIdxCur,
                  sqlite3VdbeCurrentAddr(v)+2,
                  pIn->iBase, pIn->nPrefix);
              VdbeCoverage(v);
            }
          }
          sqlite3VdbeAddOp2(v, pIn->eEndLoopOp, pIn->iCur, pIn->addrInTop);
          VdbeCoverage(v);
          VdbeCoverageIf(v, pIn->eEndLoopOp==OP_Prev);
          VdbeCoverageIf(v, pIn->eEndLoopOp==OP_Next);
        }
................................................................................
    Expr *pHaving = p->pHaving;
    ExprList *pSort = 0;

    ExprList *pSublist = 0;       /* Expression list for sub-query */
    Window *pMWin = p->pWin;      /* Master window object */
    Window *pWin;                 /* Window object iterator */
    Table *pTab;
    u32 selFlags = p->selFlags;

    pTab = sqlite3DbMallocZero(db, sizeof(Table));
    if( pTab==0 ){
      return sqlite3ErrorToParser(db, SQLITE_NOMEM);
    }

    p->pSrc = 0;
................................................................................
    p->pSrc = sqlite3SrcListAppend(pParse, 0, 0, 0);
    if( p->pSrc ){
      Table *pTab2;
      p->pSrc->a[0].pSelect = pSub;
      sqlite3SrcListAssignCursors(pParse, p->pSrc);
      pSub->selFlags |= SF_Expanded;
      pTab2 = sqlite3ResultSetOfSelect(pParse, pSub, SQLITE_AFF_NONE);
      pSub->selFlags |= (selFlags & SF_Aggregate);
      if( pTab2==0 ){
        /* Might actually be some other kind of error, but in that case
        ** pParse->nErr will be set, so if SQLITE_NOMEM is set, we will get
        ** the correct error message regardless. */
        rc = SQLITE_NOMEM;
      }else{
        memcpy(pTab, pTab2, sizeof(Table));
................................................................................
static int windowInitAccum(Parse *pParse, Window *pMWin){
  Vdbe *v = sqlite3GetVdbe(pParse);
  int regArg;
  int nArg = 0;
  Window *pWin;
  for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
    FuncDef *pFunc = pWin->pFunc;
    assert( pWin->regAccum );
    sqlite3VdbeAddOp2(v, OP_Null, 0, pWin->regAccum);
    nArg = MAX(nArg, windowArgCount(pWin));
    if( pMWin->regStartRowid==0 ){
      if( pFunc->zName==nth_valueName || pFunc->zName==first_valueName ){
        sqlite3VdbeAddOp2(v, OP_Integer, 0, pWin->regApp);
        sqlite3VdbeAddOp2(v, OP_Integer, 0, pWin->regApp+1);
      }
................................................................................
      pNew->pPartition = sqlite3ExprListDup(db, p->pPartition, 0);
      pNew->pOrderBy = sqlite3ExprListDup(db, p->pOrderBy, 0);
      pNew->eFrmType = p->eFrmType;
      pNew->eEnd = p->eEnd;
      pNew->eStart = p->eStart;
      pNew->eExclude = p->eExclude;
      pNew->regResult = p->regResult;
      pNew->regAccum = p->regAccum;
      pNew->iArgCol = p->iArgCol;
      pNew->iEphCsr = p->iEphCsr;
      pNew->bExprArgs = p->bExprArgs;
      pNew->pStart = sqlite3ExprDup(db, p->pStart, 0);
      pNew->pEnd = sqlite3ExprDup(db, p->pEnd, 0);
      pNew->pOwner = pOwner;
      pNew->bImplicitFrame = p->bImplicitFrame;
    }
  }
  return pNew;
................................................................................
  static Expr *tokenExpr(Parse *pParse, int op, Token t){
    Expr *p = sqlite3DbMallocRawNN(pParse->db, sizeof(Expr)+t.n+1);
    if( p ){
      /* memset(p, 0, sizeof(Expr)); */
      p->op = (u8)op;
      p->affExpr = 0;
      p->flags = EP_Leaf;
      ExprClearVVAProperties(p);
      p->iAgg = -1;
      p->pLeft = p->pRight = 0;
      p->x.pList = 0;
      p->pAggInfo = 0;
      p->y.pTab = 0;
      p->op2 = 0;
      p->iTable = 0;
................................................................................
  createCollation(db, sqlite3StrBINARY, SQLITE_UTF16BE, 0, binCollFunc, 0);
  createCollation(db, sqlite3StrBINARY, SQLITE_UTF16LE, 0, binCollFunc, 0);
  createCollation(db, "NOCASE", SQLITE_UTF8, 0, nocaseCollatingFunc, 0);
  createCollation(db, "RTRIM", SQLITE_UTF8, 0, rtrimCollFunc, 0);
  if( db->mallocFailed ){
    goto opendb_out;
  }






  /* Parse the filename/URI argument
  **
  ** Only allow sensible combinations of bits in the flags argument.  
  ** Throw an error if any non-sense combination is used.  If we
  ** do not block illegal combinations here, it could trigger
  ** assert() statements in deeper layers.  Sensible combinations
................................................................................
      rc = SQLITE_NOMEM_BKPT;
    }
    sqlite3Error(db, rc);
    goto opendb_out;
  }
  sqlite3BtreeEnter(db->aDb[0].pBt);
  db->aDb[0].pSchema = sqlite3SchemaGet(db, db->aDb[0].pBt);
  if( !db->mallocFailed ){
    sqlite3SetTextEncoding(db, SCHEMA_ENC(db));
  }
  sqlite3BtreeLeave(db->aDb[0].pBt);
  db->aDb[1].pSchema = sqlite3SchemaGet(db, 0);

  /* The default safety_level for the main database is FULL; for the temp
  ** database it is OFF. This matches the pager layer defaults.  
  */
  db->aDb[0].zDbSName = "main";
................................................................................
  int rc = SQLITE_OK;             /* Return code */
  const char *zCsr = zNode;       /* Cursor to iterate through node */
  const char *zEnd = &zCsr[nNode];/* End of interior node buffer */
  char *zBuffer = 0;              /* Buffer to load terms into */
  i64 nAlloc = 0;                 /* Size of allocated buffer */
  int isFirstTerm = 1;            /* True when processing first term on page */
  sqlite3_int64 iChild;           /* Block id of child node to descend to */
  int nBuffer = 0;                /* Total term size */

  /* Skip over the 'height' varint that occurs at the start of every 
  ** interior node. Then load the blockid of the left-child of the b-tree
  ** node into variable iChild.  
  **
  ** Even if the data structure on disk is corrupted, this (reading two
  ** varints from the buffer) does not risk an overread. If zNode is a
................................................................................
    return FTS_CORRUPT_VTAB;
  }
  
  while( zCsr<zEnd && (piFirst || piLast) ){
    int cmp;                      /* memcmp() result */
    int nSuffix;                  /* Size of term suffix */
    int nPrefix = 0;              /* Size of term prefix */

  
    /* Load the next term on the node into zBuffer. Use realloc() to expand
    ** the size of zBuffer if required.  */
    if( !isFirstTerm ){
      zCsr += fts3GetVarint32(zCsr, &nPrefix);
      if( nPrefix>nBuffer ){
        rc = FTS_CORRUPT_VTAB;
        goto finish_scan;
      }
    }
    isFirstTerm = 0;
    zCsr += fts3GetVarint32(zCsr, &nSuffix);
    
    assert( nPrefix>=0 && nSuffix>=0 );
    if( nPrefix>zCsr-zNode || nSuffix>zEnd-zCsr || nSuffix==0 ){
      rc = FTS_CORRUPT_VTAB;
................................................................................
      }
    }

    /* If nSeg is less that zero, then there is no level with at least
    ** nMin segments and no hint in the %_stat table. No work to do.
    ** Exit early in this case.  */
    if( nSeg<=0 ) break;

    assert( nMod<=0x7FFFFFFF );
    if( iAbsLevel<0 || iAbsLevel>(nMod<<32) ){
      rc = FTS_CORRUPT_VTAB;
      break;
    }

    /* Open a cursor to iterate through the contents of the oldest nSeg 
    ** indexes of absolute level iAbsLevel. If this cursor is opened using 
    ** the 'hint' parameters, it is possible that there are less than nSeg
    ** segments available in level iAbsLevel. In this case, no work is
    ** done on iAbsLevel - fall through to the next iteration of the loop 
    ** to start work on some other level.  */
................................................................................
    const char *zArg = argv[ii];
    if( zArg[0]=='+' ){
      pRtree->nAux++;
      sqlite3_str_appendf(pSql, ",%.*s", rtreeTokenLength(zArg+1), zArg+1);
    }else if( pRtree->nAux>0 ){
      break;
    }else{
      static const char *azFormat[] = {",%.*s REAL", ",%.*s INT"};
      pRtree->nDim2++;
      sqlite3_str_appendf(pSql, azFormat[eCoordType],
                          rtreeTokenLength(zArg), zArg);
    }
  }
  sqlite3_str_appendf(pSql, ");");
  zSql = sqlite3_str_finish(pSql);
  if( !zSql ){
    rc = SQLITE_NOMEM;
  }else if( ii<argc ){
................................................................................
    /* There are now 4 possibilities:
    **
    **     1. uPattern is an unescaped match-all character "%",
    **     2. uPattern is an unescaped match-one character "_",
    **     3. uPattern is an unescaped escape character, or
    **     4. uPattern is to be handled as an ordinary character
    */
    if( uPattern==MATCH_ALL && !prevEscape && uPattern!=(uint32_t)uEsc ){
      /* Case 1. */
      uint8_t c;

      /* Skip any MATCH_ALL or MATCH_ONE characters that follow a
      ** MATCH_ALL. For each MATCH_ONE, skip one character in the 
      ** test string.
      */
................................................................................
        if( icuLikeCompare(zPattern, zString, uEsc) ){
          return 1;
        }
        SQLITE_ICU_SKIP_UTF8(zString);
      }
      return 0;

    }else if( uPattern==MATCH_ONE && !prevEscape && uPattern!=(uint32_t)uEsc ){
      /* Case 2. */
      if( *zString==0 ) return 0;
      SQLITE_ICU_SKIP_UTF8(zString);

    }else if( uPattern==(uint32_t)uEsc && !prevEscape ){
      /* Case 3. */
      prevEscape = 1;

    }else{
      /* Case 4. */
      uint32_t uString;
      SQLITE_ICU_READ_UTF8(zString, uString);
................................................................................
        break;
      }
    }
  }
  i = 0;
  if( iSchema>=0 ){
    pIdxInfo->aConstraintUsage[iSchema].argvIndex = ++i;
    pIdxInfo->aConstraintUsage[iSchema].omit = 1;
    pIdxInfo->idxNum |= 0x01;
  }
  if( iName>=0 ){
    pIdxInfo->aConstraintUsage[iName].argvIndex = ++i;
    pIdxInfo->idxNum |= 0x02;
  }
  if( iAgg>=0 ){
................................................................................
        if( nLocal<0 ) goto statPageIsCorrupt;
        pCell->nLocal = nLocal;
        assert( nPayload>=(u32)nLocal );
        assert( nLocal<=(nUsable-35) );
        if( nPayload>(u32)nLocal ){
          int j;
          int nOvfl = ((nPayload - nLocal) + nUsable-4 - 1) / (nUsable - 4);
          if( iOff+nLocal>nUsable || nPayload>0x7fffffff ){
            goto statPageIsCorrupt;
          }
          pCell->nLastOvfl = (nPayload-nLocal) - (nOvfl-1) * (nUsable-4);
          pCell->nOvfl = nOvfl;
          pCell->aOvfl = sqlite3_malloc64(sizeof(u32)*nOvfl);
          if( pCell->aOvfl==0 ) return SQLITE_NOMEM_BKPT;
          pCell->aOvfl[0] = sqlite3Get4byte(&aData[iOff+nLocal]);
          for(j=1; j<nOvfl; j++){
            int rc;
................................................................................
){
  int i;
  const char *zSep = "";
  int rc = SQLITE_OK;
  SessionBuffer buf = {0, 0, 0};
  int nPk = 0;

  sessionAppendStr(&buf, "DELETE FROM main.", &rc);
  sessionAppendIdent(&buf, zTab, &rc);
  sessionAppendStr(&buf, " WHERE ", &rc);

  for(i=0; i<p->nCol; i++){
    if( p->abPK[i] ){
      nPk++;
      sessionAppendStr(&buf, zSep, &rc);
................................................................................
){
  int rc = SQLITE_OK;
  int i;
  const char *zSep = "";
  SessionBuffer buf = {0, 0, 0};

  /* Append "UPDATE tbl SET " */
  sessionAppendStr(&buf, "UPDATE main.", &rc);
  sessionAppendIdent(&buf, zTab, &rc);
  sessionAppendStr(&buf, " SET ", &rc);

  /* Append the assignments */
  for(i=0; i<p->nCol; i++){
    sessionAppendStr(&buf, zSep, &rc);
    sessionAppendIdent(&buf, p->azCol[i], &rc);
................................................................................
static void fts5SourceIdFunc(
  sqlite3_context *pCtx,          /* Function call context */
  int nArg,                       /* Number of args */
  sqlite3_value **apUnused        /* Function arguments */
){
  assert( nArg==0 );
  UNUSED_PARAM2(nArg, apUnused);
  sqlite3_result_text(pCtx, "fts5: 2020-03-21 23:10:38 5d14a1c4f2fc17de98ad685ad1422cdfda89dfccb00afcaf32ee416b6f84f525", -1, SQLITE_TRANSIENT);
}

/*
** Return true if zName is the extension on one of the shadow tables used
** by this module.
*/
static int fts5ShadowName(const char *zName){
................................................................................
#endif
  return rc;
}
#endif /* SQLITE_CORE */
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_STMTVTAB) */

/************** End of stmt.c ************************************************/
#if __LINE__!=228515
#undef SQLITE_SOURCE_ID
#define SQLITE_SOURCE_ID      "2020-03-21 23:10:38 5d14a1c4f2fc17de98ad685ad1422cdfda89dfccb00afcaf32ee416b6f84alt2"
#endif
/* Return the source-id for this library */
SQLITE_API const char *sqlite3_sourceid(void){ return SQLITE_SOURCE_ID; }
/************************** End of sqlite3.c ******************************/

Changes to src/sqlite3.h.

121
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**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.32.0"
#define SQLITE_VERSION_NUMBER 3032000
#define SQLITE_SOURCE_ID      "2020-02-27 16:21:39 951b39ca74c9bd933139e099d5555283278db475f410f202c162e5d1e6aef933"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros







|







121
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**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.32.0"
#define SQLITE_VERSION_NUMBER 3032000
#define SQLITE_SOURCE_ID      "2020-03-21 23:10:38 5d14a1c4f2fc17de98ad685ad1422cdfda89dfccb00afcaf32ee416b6f84f525"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros