Fossil

  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  Decimal *pA = decimal_new(context, argv[0], 0, 0);
  Decimal *pB = decimal_new(context, argv[1], 0, 0);
  UNUSED_PARAMETER(argc);
  if( pB ){
    pB->sign = !pB->sign;
    decimal_add(pA, pB);
    decimal_result(context, pA);
  }
  decimal_free(pA);
  decimal_free(pB);
}

/* Aggregate funcion:   decimal_sum(X)
**
** Works like sum() except that it uses decimal arithmetic for unlimited

  "       -x     Send output as CSV to a spreadsheet (same as \".excel\")",
#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",
#ifndef SQLITE_OMIT_DESERIALIZE
  "        --deserialize   Load into memory using sqlite3_deserialize()",
  "        --hexdb         Load the output of \"dbtotxt\" as an in-memory db",
  "        --maxsize N     Maximum size for --hexdb or --deserialized database",
#endif
  "        --new           Initialize FILE to an empty database",
  "        --nofollow      Do not follow symbolic links",
  "        --readonly      Open FILE readonly",
  "        --zip           FILE is a ZIP archive",

      rc = SHELL_OPEN_ZIPFILE;
    }
  }
  fclose(f);
  return rc;  
}

#ifndef SQLITE_OMIT_DESERIALIZE
/*
** Reconstruct an in-memory database using the output from the "dbtotxt"
** program.  Read content from the file in p->zDbFilename.  If p->zDbFilename
** is 0, then read from standard input.
*/
static unsigned char *readHexDb(ShellState *p, int *pnData){
  unsigned char *a = 0;

    }
    p->lineno = nLine;
  }
  sqlite3_free(a);
  utf8_printf(stderr,"Error on line %d of --hexdb input\n", nLine);
  return 0;
}
#endif /* SQLITE_OMIT_DESERIALIZE */

/*
** Scalar function "shell_int32". The first argument to this function
** must be a blob. The second a non-negative integer. This function
** reads and returns a 32-bit big-endian integer from byte
** offset (4*<arg2>) of the blob.
*/

#endif
    if( p->openMode==SHELL_OPEN_ZIPFILE ){
      char *zSql = sqlite3_mprintf(
         "CREATE VIRTUAL TABLE zip USING zipfile(%Q);", p->zDbFilename);
      sqlite3_exec(p->db, zSql, 0, 0, 0);
      sqlite3_free(zSql);
    }
#ifndef SQLITE_OMIT_DESERIALIZE
    else
    if( p->openMode==SHELL_OPEN_DESERIALIZE || p->openMode==SHELL_OPEN_HEXDB ){
      int rc;
      int nData = 0;
      unsigned char *aData;
      if( p->openMode==SHELL_OPEN_DESERIALIZE ){
        aData = (unsigned char*)readFile(p->zDbFilename, &nData);

  int rc = *pRc;
  if( rc==SQLITE_OK ){
    char *zErr = 0;
    rc = sqlite3_exec(db, zSql, 0, 0, &zErr);
    if( rc!=SQLITE_OK ){
      raw_printf(stderr, "SQL error: %s\n", zErr);
    }
    sqlite3_free(zErr);
    *pRc = rc;
  }
}

/*
** Like shellExec(), except that zFmt is a printf() style format string.
*/

      sqlite3_snprintf(sizeof(zBuf), zBuf, "%lld", iRes);
      raw_printf(p->out, "%s\n", zBuf);
    }
  }else

  if( c=='f' && strncmp(azArg[0], "fullschema", n)==0 ){
    ShellState data;

    int doStats = 0;
    memcpy(&data, p, sizeof(data));
    data.showHeader = 0;
    data.cMode = data.mode = MODE_Semi;
    if( nArg==2 && optionMatch(azArg[1], "indent") ){
      data.cMode = data.mode = MODE_Pretty;
      nArg = 1;

    rc = sqlite3_exec(p->db,
       "SELECT sql FROM"
       "  (SELECT sql sql, type type, tbl_name tbl_name, name name, rowid x"
       "     FROM sqlite_schema UNION ALL"
       "   SELECT sql, type, tbl_name, name, rowid FROM sqlite_temp_schema) "
       "WHERE type!='meta' AND sql NOTNULL AND name NOT LIKE 'sqlite_%' "
       "ORDER BY rowid",
       callback, &data, 0
    );
    if( rc==SQLITE_OK ){
      sqlite3_stmt *pStmt;
      rc = sqlite3_prepare_v2(p->db,
               "SELECT rowid FROM sqlite_schema"
               " WHERE name GLOB 'sqlite_stat[134]'",
               -1, &pStmt, 0);
      doStats = sqlite3_step(pStmt)==SQLITE_ROW;
      sqlite3_finalize(pStmt);
    }
    if( doStats==0 ){
      raw_printf(p->out, "/* No STAT tables available */\n");
    }else{
      raw_printf(p->out, "ANALYZE sqlite_schema;\n");
      sqlite3_exec(p->db, "SELECT 'ANALYZE sqlite_schema'",
                   callback, &data, 0);
      data.cMode = data.mode = MODE_Insert;
      data.zDestTable = "sqlite_stat1";
      shell_exec(&data, "SELECT * FROM sqlite_stat1", 0);
      data.zDestTable = "sqlite_stat4";
      shell_exec(&data, "SELECT * FROM sqlite_stat4", 0);
      raw_printf(p->out, "ANALYZE sqlite_schema;\n");
    }
  }else

  if( c=='h' && strncmp(azArg[0], "headers", n)==0 ){
    if( nArg==2 ){
      p->showHeader = booleanValue(azArg[1]);

#endif
      }else if( optionMatch(z, "append") ){
        p->openMode = SHELL_OPEN_APPENDVFS;
      }else if( optionMatch(z, "readonly") ){
        p->openMode = SHELL_OPEN_READONLY;
      }else if( optionMatch(z, "nofollow") ){
        p->openFlags |= SQLITE_OPEN_NOFOLLOW;
#ifndef SQLITE_OMIT_DESERIALIZE
      }else if( optionMatch(z, "deserialize") ){
        p->openMode = SHELL_OPEN_DESERIALIZE;
      }else if( optionMatch(z, "hexdb") ){
        p->openMode = SHELL_OPEN_HEXDB;
      }else if( optionMatch(z, "maxsize") && iName+1<nArg ){
        p->szMax = integerValue(azArg[++iName]);
#endif /* SQLITE_OMIT_DESERIALIZE */
      }else if( z[0]=='-' ){
        utf8_printf(stderr, "unknown option: %s\n", z);
        rc = 1;
        goto meta_command_exit;
      }else if( zNewFilename ){
        utf8_printf(stderr, "extra argument: \"%s\"\n", z);
        rc = 1;

  "   -ascii               set output mode to 'ascii'\n"
  "   -bail                stop after hitting an error\n"
  "   -batch               force batch I/O\n"
  "   -box                 set output mode to 'box'\n"
  "   -column              set output mode to 'column'\n"
  "   -cmd COMMAND         run \"COMMAND\" before reading stdin\n"
  "   -csv                 set output mode to 'csv'\n"
#if !defined(SQLITE_OMIT_DESERIALIZE)
  "   -deserialize         open the database using sqlite3_deserialize()\n"
#endif
  "   -echo                print commands before execution\n"
  "   -init FILENAME       read/process named file\n"
  "   -[no]header          turn headers on or off\n"
#if defined(SQLITE_ENABLE_MEMSYS3) || defined(SQLITE_ENABLE_MEMSYS5)
  "   -heap SIZE           Size of heap for memsys3 or memsys5\n"
#endif
  "   -help                show this message\n"
  "   -html                set output mode to HTML\n"
  "   -interactive         force interactive I/O\n"
  "   -json                set output mode to 'json'\n"
  "   -line                set output mode to 'line'\n"
  "   -list                set output mode to 'list'\n"
  "   -lookaside SIZE N    use N entries of SZ bytes for lookaside memory\n"
  "   -markdown            set output mode to 'markdown'\n"
#if !defined(SQLITE_OMIT_DESERIALIZE)
  "   -maxsize N           maximum size for a --deserialize database\n"
#endif
  "   -memtrace            trace all memory allocations and deallocations\n"
  "   -mmap N              default mmap size set to N\n"
#ifdef SQLITE_ENABLE_MULTIPLEX
  "   -multiplex           enable the multiplexor VFS\n"
#endif

      zVfs = cmdline_option_value(argc, argv, ++i);
#ifdef SQLITE_HAVE_ZLIB
    }else if( strcmp(z,"-zip")==0 ){
      data.openMode = SHELL_OPEN_ZIPFILE;
#endif
    }else if( strcmp(z,"-append")==0 ){
      data.openMode = SHELL_OPEN_APPENDVFS;
#ifndef SQLITE_OMIT_DESERIALIZE
    }else if( strcmp(z,"-deserialize")==0 ){
      data.openMode = SHELL_OPEN_DESERIALIZE;
    }else if( strcmp(z,"-maxsize")==0 && i+1<argc ){
      data.szMax = integerValue(argv[++i]);
#endif
    }else if( strcmp(z,"-readonly")==0 ){
      data.openMode = SHELL_OPEN_READONLY;

      memcpy(data.colSeparator,",",2);
#ifdef SQLITE_HAVE_ZLIB
    }else if( strcmp(z,"-zip")==0 ){
      data.openMode = SHELL_OPEN_ZIPFILE;
#endif
    }else if( strcmp(z,"-append")==0 ){
      data.openMode = SHELL_OPEN_APPENDVFS;
#ifndef SQLITE_OMIT_DESERIALIZE
    }else if( strcmp(z,"-deserialize")==0 ){
      data.openMode = SHELL_OPEN_DESERIALIZE;
    }else if( strcmp(z,"-maxsize")==0 && i+1<argc ){
      data.szMax = integerValue(argv[++i]);
#endif
    }else if( strcmp(z,"-readonly")==0 ){
      data.openMode = SHELL_OPEN_READONLY;

**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.36.0"
#define SQLITE_VERSION_NUMBER 3036000
#define SQLITE_SOURCE_ID      "2021-05-14 15:37:00 cf63abbe559d04f993f99a37d41ba4a97c0261094f1d4cc05cfa23b1e11731f5"

/*
** 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

** value of type (int). The integer value is set to 1 if the database is a wal
** mode database and there exists at least one client in another process that
** currently has an SQL transaction open on the database. It is set to 0 if
** the database is not a wal-mode db, or if there is no such connection in any
** other process. This opcode cannot be used to detect transactions opened
** by clients within the current process, only within other processes.
** </ul>
**
** <li>[[SQLITE_FCNTL_CKSM_FILE]]
** Used by the cksmvfs VFS module only.
** </ul>
*/
#define SQLITE_FCNTL_LOCKSTATE               1
#define SQLITE_FCNTL_GET_LOCKPROXYFILE       2
#define SQLITE_FCNTL_SET_LOCKPROXYFILE       3
#define SQLITE_FCNTL_LAST_ERRNO              4
#define SQLITE_FCNTL_SIZE_HINT               5
#define SQLITE_FCNTL_CHUNK_SIZE              6

#define SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE  33
#define SQLITE_FCNTL_LOCK_TIMEOUT           34
#define SQLITE_FCNTL_DATA_VERSION           35
#define SQLITE_FCNTL_SIZE_LIMIT             36
#define SQLITE_FCNTL_CKPT_DONE              37
#define SQLITE_FCNTL_RESERVE_BYTES          38
#define SQLITE_FCNTL_CKPT_START             39

#define SQLITE_FCNTL_EXTERNAL_READER        40
#define SQLITE_FCNTL_CKSM_FILE              41

/* deprecated names */
#define SQLITE_GET_LOCKPROXYFILE      SQLITE_FCNTL_GET_LOCKPROXYFILE
#define SQLITE_SET_LOCKPROXYFILE      SQLITE_FCNTL_SET_LOCKPROXYFILE
#define SQLITE_LAST_ERRNO             SQLITE_FCNTL_LAST_ERRNO

** sqlite3_stmt_readonly() to return true since, while those statements
** change the configuration of a database connection, they do not make
** changes to the content of the database files on disk.
** ^The sqlite3_stmt_readonly() interface returns true for [BEGIN] since
** [BEGIN] merely sets internal flags, but the [BEGIN|BEGIN IMMEDIATE] and
** [BEGIN|BEGIN EXCLUSIVE] commands do touch the database and so
** sqlite3_stmt_readonly() returns false for those commands.
**
** ^This routine returns false if there is any possibility that the
** statement might change the database file.  ^A false return does
** not guarantee that the statement will change the database file.
** ^For example, an UPDATE statement might have a WHERE clause that
** makes it a no-op, but the sqlite3_stmt_readonly() result would still
** be false.  ^Similarly, a CREATE TABLE IF NOT EXISTS statement is a
** read-only no-op if the table already exists, but
** sqlite3_stmt_readonly() still returns false for such a statement.
*/
SQLITE_API int sqlite3_stmt_readonly(sqlite3_stmt *pStmt);

/*
** CAPI3REF: Query The EXPLAIN Setting For A Prepared Statement
** METHOD: sqlite3_stmt
**

** that parameter must be the byte offset
** where the NUL terminator would occur assuming the string were NUL
** terminated.  If any NUL characters occurs at byte offsets less than
** the value of the fourth parameter then the resulting string value will
** contain embedded NULs.  The result of expressions involving strings
** with embedded NULs is undefined.
**
** ^The fifth argument to the BLOB and string binding interfaces controls
** or indicates the lifetime of the object referenced by the third parameter.
** ^These three options exist:
** ^(1) A destructor to dispose of the BLOB or string after SQLite has finished
** with it may be passed. ^It is called to dispose of the BLOB or string even
** if the call to the bind API fails, except the destructor is not called if
** the third parameter is a NULL pointer or the fourth parameter is negative.

** ^(2) The special constant, [SQLITE_STATIC], may be passsed to indicate that
** the application remains responsible for disposing of the object. ^In this
** case, the object and the provided pointer to it must remain valid until
** either the prepared statement is finalized or the same SQL parameter is
** bound to something else, whichever occurs sooner.
** ^(3) The constant, [SQLITE_TRANSIENT], may be passed to indicate that the

** object is to be copied prior to the return from sqlite3_bind_*(). ^The
** object and pointer to it must remain valid until then. ^SQLite will then
** manage the lifetime of its private copy.
**
** ^The sixth argument to sqlite3_bind_text64() must be one of
** [SQLITE_UTF8], [SQLITE_UTF16], [SQLITE_UTF16BE], or [SQLITE_UTF16LE]
** to specify the encoding of the text in the third parameter.  If
** the sixth argument to sqlite3_bind_text64() is not one of the
** allowed values shown above, or if the text encoding is different
** from the encoding specified by the sixth parameter, then the behavior

** SQLITE_SERIALIZE_NOCOPY bit is set but no contiguous copy
** of the database exists.
**
** A call to sqlite3_serialize(D,S,P,F) might return NULL even if the
** SQLITE_SERIALIZE_NOCOPY bit is omitted from argument F if a memory
** allocation error occurs.
**
** This interface is omitted if SQLite is compiled with the
** [SQLITE_OMIT_DESERIALIZE] option.
*/
SQLITE_API unsigned char *sqlite3_serialize(
  sqlite3 *db,           /* The database connection */
  const char *zSchema,   /* Which DB to serialize. ex: "main", "temp", ... */
  sqlite3_int64 *piSize, /* Write size of the DB here, if not NULL */
  unsigned int mFlags    /* Zero or more SQLITE_SERIALIZE_* flags */
);

** database is currently in a read transaction or is involved in a backup
** operation.
**
** If sqlite3_deserialize(D,S,P,N,M,F) fails for any reason and if the
** SQLITE_DESERIALIZE_FREEONCLOSE bit is set in argument F, then
** [sqlite3_free()] is invoked on argument P prior to returning.
**
** This interface is omitted if SQLite is compiled with the
** [SQLITE_OMIT_DESERIALIZE] option.
*/
SQLITE_API int sqlite3_deserialize(
  sqlite3 *db,            /* The database connection */
  const char *zSchema,    /* Which DB to reopen with the deserialization */
  unsigned char *pData,   /* The serialized database content */
  sqlite3_int64 szDb,     /* Number bytes in the deserialization */
  sqlite3_int64 szBuf,    /* Total size of buffer pData[] */

/*
** CAPIREF: Conigure a Session Object
** METHOD: sqlite3_session
**
** This method is used to configure a session object after it has been
** created. At present the only valid value for the second parameter is
** [SQLITE_SESSION_OBJCONFIG_SIZE].
**



** Arguments for sqlite3session_object_config()
**
** The following values may passed as the the 4th parameter to
** sqlite3session_object_config().
**
** <dt>SQLITE_SESSION_OBJCONFIG_SIZE <dd>
**   This option is used to set, clear or query the flag that enables
**   the [sqlite3session_changeset_size()] API. Because it imposes some
**   computational overhead, this API is disabled by default. Argument
**   pArg must point to a value of type (int). If the value is initially
**   0, then the sqlite3session_changeset_size() API is disabled. If it
**   is greater than 0, then the same API is enabled. Or, if the initial
**   value is less than zero, no change is made. In all cases the (int)
**   variable is set to 1 if the sqlite3session_changeset_size() API is
**   enabled following the current call, or 0 otherwise.
**
**   It is an error (SQLITE_MISUSE) to attempt to modify this setting after
**   the first table has been attached to the session object.
*/
SQLITE_API int sqlite3session_object_config(sqlite3_session*, int op, void *pArg);

/*
*/
#define SQLITE_SESSION_OBJCONFIG_SIZE 1

/*
** CAPI3REF: Enable Or Disable A Session Object
** METHOD: sqlite3_session
**

  sqlite3_session *pSession,      /* Session object */
  int *pnChangeset,               /* OUT: Size of buffer at *ppChangeset */
  void **ppChangeset              /* OUT: Buffer containing changeset */
);

/*
** CAPI3REF: Return An Upper-limit For The Size Of The Changeset
** METHOD: sqlite3_session
**
** By default, this function always returns 0. For it to return
** a useful result, the sqlite3_session object must have been configured
** to enable this API using sqlite3session_object_config() with the
** SQLITE_SESSION_OBJCONFIG_SIZE verb.
**
** When enabled, this function returns an upper limit, in bytes, for the size
** of the changeset that might be produced if sqlite3session_changeset() were
** called. The final changeset size might be equal to or smaller than the
** size in bytes returned by this function.
*/

#define SQLITE_Stat4          0x00000800 /* Use STAT4 data */
   /* TH3 expects this value  ^^^^^^^^^^ to be 0x0000800. Don't change it */
#define SQLITE_PushDown       0x00001000 /* The push-down optimization */
#define SQLITE_SimplifyJoin   0x00002000 /* Convert LEFT JOIN to JOIN */
#define SQLITE_SkipScan       0x00004000 /* Skip-scans */
#define SQLITE_PropagateConst 0x00008000 /* The constant propagation opt */
#define SQLITE_MinMaxOpt      0x00010000 /* The min/max optimization */

#define SQLITE_AllOpts        0xffffffff /* All optimizations */

/*
** Macros for testing whether or not optimizations are enabled or disabled.
*/
#define OptimizationDisabled(db, mask)  (((db)->dbOptFlags&(mask))!=0)
#define OptimizationEnabled(db, mask)   (((db)->dbOptFlags&(mask))==0)

#ifdef SQLITE_VDBE_COVERAGE
  /* The following callback (if not NULL) is invoked on every VDBE branch
  ** operation.  Set the callback using SQLITE_TESTCTRL_VDBE_COVERAGE.
  */
  void (*xVdbeBranch)(void*,unsigned iSrcLine,u8 eThis,u8 eMx);  /* Callback */
  void *pVdbeBranchArg;                                     /* 1st argument */
#endif
#ifndef SQLITE_OMIT_DESERIALIZE
  sqlite3_int64 mxMemdbSize;        /* Default max memdb size */
#endif
#ifndef SQLITE_UNTESTABLE
  int (*xTestCallback)(int);        /* Invoked by sqlite3FaultSim() */
#endif
  int bLocaltimeFault;              /* True to fail localtime() calls */
  int iOnceResetThreshold;          /* When to reset OP_Once counters */

SQLITE_PRIVATE u8 sqlite3HexToInt(int h);
SQLITE_PRIVATE int sqlite3TwoPartName(Parse *, Token *, Token *, Token **);

#if defined(SQLITE_NEED_ERR_NAME)
SQLITE_PRIVATE const char *sqlite3ErrName(int);
#endif

#ifndef SQLITE_OMIT_DESERIALIZE
SQLITE_PRIVATE int sqlite3MemdbInit(void);
#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*);

   0,                         /* xSqllog */
   0,                         /* pSqllogArg */
#endif
#ifdef SQLITE_VDBE_COVERAGE
   0,                         /* xVdbeBranch */
   0,                         /* pVbeBranchArg */
#endif
#ifndef SQLITE_OMIT_DESERIALIZE
   SQLITE_MEMDB_DEFAULT_MAXSIZE,   /* mxMemdbSize */
#endif
#ifndef SQLITE_UNTESTABLE
   0,                         /* xTestCallback */
#endif
   0,                         /* bLocaltimeFault */
   0x7ffffffe,                /* iOnceResetThreshold */

** This file implements an in-memory VFS. A database is held as a contiguous
** block of memory.
**
** This file also implements interface sqlite3_serialize() and
** sqlite3_deserialize().
*/
/* #include "sqliteInt.h" */
#ifndef SQLITE_OMIT_DESERIALIZE

/*
** Forward declaration of objects used by this utility
*/
typedef struct sqlite3_vfs MemVfs;
typedef struct MemFile MemFile;
typedef struct MemStore MemStore;

/* Access to a lower-level VFS that (might) implement dynamic loading,
** access to randomness, etc.
*/
#define ORIGVFS(p) ((sqlite3_vfs*)((p)->pAppData))

/* Storage for a memdb file.
**
** An memdb object can be shared or separate.  Shared memdb objects can be
** used by more than one database connection.  Mutexes are used by shared
** memdb objects to coordinate access.  Separate memdb objects are only
** connected to a single database connection and do not require additional
** mutexes.
**
** Shared memdb objects have .zFName!=0 and .pMutex!=0.  They are created
** using "file:/name?vfs=memdb".  The first character of the name must be
** "/" or else the object will be a separate memdb object.  All shared
** memdb objects are stored in memdb_g.apMemStore[] in an arbitrary order.
**
** Separate memdb objects are created using a name that does not begin
** with "/" or using sqlite3_deserialize().
**
** Access rules for shared MemStore objects:
**
**   *  .zFName is initialized when the object is created and afterwards
**      is unchanged until the object is destroyed.  So it can be accessed
**      at any time as long as we know the object is not being destroyed,
**      which means while either the SQLITE_MUTEX_STATIC_VFS1 or
**      .pMutex is held or the object is not part of memdb_g.apMemStore[].
**
**   *  Can .pMutex can only be changed while holding the
**      SQLITE_MUTEX_STATIC_VFS1 mutex or while the object is not part
**      of memdb_g.apMemStore[].
**
**   *  Other fields can only be changed while holding the .pMutex mutex
**      or when the .nRef is less than zero and the object is not part of
**      memdb_g.apMemStore[].
**
**   *  The .aData pointer has the added requirement that it can can only
**      be changed (for resizing) when nMmap is zero.
**
*/
struct MemStore {

  sqlite3_int64 sz;               /* Size of the file */
  sqlite3_int64 szAlloc;          /* Space allocated to aData */
  sqlite3_int64 szMax;            /* Maximum allowed size of the file */
  unsigned char *aData;           /* content of the file */
  sqlite3_mutex *pMutex;          /* Used by shared stores only */
  int nMmap;                      /* Number of memory mapped pages */
  unsigned mFlags;                /* Flags */
  int nRdLock;                    /* Number of readers */
  int nWrLock;                    /* Number of writers.  (Always 0 or 1) */
  int nRef;                       /* Number of users of this MemStore */
  char *zFName;                   /* The filename for shared stores */
};

/* An open file */
struct MemFile {
  sqlite3_file base;              /* IO methods */
  MemStore *pStore;               /* The storage */
  int eLock;                      /* Most recent lock against this file */
};

/*
** Global variables for holding the memdb files that are accessible
** to multiple database connections in separate threads.
**
** Must hold SQLITE_MUTEX_STATIC_VFS1 to access any part of this object.
*/
struct MemFS {
  int nMemStore;                  /* Number of shared MemStore objects */
  MemStore **apMemStore;          /* Array of all shared MemStore objects */
} memdb_g;

/*
** Methods for MemFile
*/
static int memdbClose(sqlite3_file*);
static int memdbRead(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst);
static int memdbWrite(sqlite3_file*,const void*,int iAmt, sqlite3_int64 iOfst);
static int memdbTruncate(sqlite3_file*, sqlite3_int64 size);

  0,                               /* xShmLock */
  0,                               /* xShmBarrier */
  0,                               /* xShmUnmap */
  memdbFetch,                      /* xFetch */
  memdbUnfetch                     /* xUnfetch */
};

/*
** Enter/leave the mutex on a MemStore
*/
static void memdbEnter(MemStore *p){
  sqlite3_mutex_enter(p->pMutex);
}
static void memdbLeave(MemStore *p){
  sqlite3_mutex_leave(p->pMutex);
}



/*
** Close an memdb-file.
** Free the underlying MemStore object when its refcount drops to zero
** or less.



*/
static int memdbClose(sqlite3_file *pFile){
  MemStore *p = ((MemFile*)pFile)->pStore;
  if( p->zFName ){
    int i;
#ifndef SQLITE_MUTEX_OMIT
    sqlite3_mutex *pVfsMutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_VFS1);
#endif
    sqlite3_mutex_enter(pVfsMutex);
    for(i=0; ALWAYS(i<memdb_g.nMemStore); i++){
      if( memdb_g.apMemStore[i]==p ){
        memdbEnter(p);
        if( p->nRef==1 ){
          memdb_g.apMemStore[i] = memdb_g.apMemStore[--memdb_g.nMemStore];
          if( memdb_g.nMemStore==0 ){
            sqlite3_free(memdb_g.apMemStore);
            memdb_g.apMemStore = 0;
          }
        }
        break;
      }
    }
    sqlite3_mutex_leave(pVfsMutex);
  }else{
    memdbEnter(p);
  }
  p->nRef--;
  if( p->nRef<=0 ){
    if( p->mFlags & SQLITE_DESERIALIZE_FREEONCLOSE ){
      sqlite3_free(p->aData);
    }
    memdbLeave(p);
    sqlite3_mutex_free(p->pMutex);
    sqlite3_free(p);
  }else{
    memdbLeave(p);
  }
  return SQLITE_OK;
}

/*
** Read data from an memdb-file.
*/
static int memdbRead(
  sqlite3_file *pFile,
  void *zBuf,
  int iAmt,
  sqlite_int64 iOfst
){
  MemStore *p = ((MemFile*)pFile)->pStore;
  memdbEnter(p);
  if( iOfst+iAmt>p->sz ){
    memset(zBuf, 0, iAmt);
    if( iOfst<p->sz ) memcpy(zBuf, p->aData+iOfst, p->sz - iOfst);
    memdbLeave(p);
    return SQLITE_IOERR_SHORT_READ;
  }
  memcpy(zBuf, p->aData+iOfst, iAmt);
  memdbLeave(p);
  return SQLITE_OK;
}

/*
** Try to enlarge the memory allocation to hold at least sz bytes
*/
static int memdbEnlarge(MemStore *p, sqlite3_int64 newSz){
  unsigned char *pNew;
  if( (p->mFlags & SQLITE_DESERIALIZE_RESIZEABLE)==0 || p->nMmap>0 ){
    return SQLITE_FULL;
  }
  if( newSz>p->szMax ){
    return SQLITE_FULL;
  }

*/
static int memdbWrite(
  sqlite3_file *pFile,
  const void *z,
  int iAmt,
  sqlite_int64 iOfst
){
  MemStore *p = ((MemFile*)pFile)->pStore;
  memdbEnter(p);
  if( NEVER(p->mFlags & SQLITE_DESERIALIZE_READONLY) ){
    /* Can't happen: memdbLock() will return SQLITE_READONLY before
    ** reaching this point */
    memdbLeave(p);
    return SQLITE_IOERR_WRITE;
  }
  if( iOfst+iAmt>p->sz ){
    int rc;
    if( iOfst+iAmt>p->szAlloc
     && (rc = memdbEnlarge(p, iOfst+iAmt))!=SQLITE_OK
    ){
      memdbLeave(p);
      return rc;
    }
    if( iOfst>p->sz ) memset(p->aData+p->sz, 0, iOfst-p->sz);
    p->sz = iOfst+iAmt;
  }
  memcpy(p->aData+iOfst, z, iAmt);
  memdbLeave(p);
  return SQLITE_OK;
}

/*
** Truncate an memdb-file.
**
** In rollback mode (which is always the case for memdb, as it does not
** support WAL mode) the truncate() method is only used to reduce
** the size of a file, never to increase the size.
*/
static int memdbTruncate(sqlite3_file *pFile, sqlite_int64 size){
  MemStore *p = ((MemFile*)pFile)->pStore;
  int rc = SQLITE_OK;
  memdbEnter(p);
  if( NEVER(size>p->sz) ){
    rc = SQLITE_FULL;
  }else{
    p->sz = size;
  }
  memdbLeave(p);
  return rc;
}

/*
** Sync an memdb-file.
*/
static int memdbSync(sqlite3_file *pFile, int flags){
  return SQLITE_OK;
}

/*
** Return the current file-size of an memdb-file.
*/
static int memdbFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
  MemStore *p = ((MemFile*)pFile)->pStore;
  memdbEnter(p);
  *pSize = p->sz;
  memdbLeave(p);
  return SQLITE_OK;
}

/*
** Lock an memdb-file.
*/
static int memdbLock(sqlite3_file *pFile, int eLock){
  MemFile *pThis = (MemFile*)pFile;
  MemStore *p = pThis->pStore;
  int rc = SQLITE_OK;
  if( eLock==pThis->eLock ) return SQLITE_OK;
  memdbEnter(p);
  if( eLock>SQLITE_LOCK_SHARED ){
    if( p->mFlags & SQLITE_DESERIALIZE_READONLY ){

      rc = SQLITE_READONLY;
    }else if( pThis->eLock<=SQLITE_LOCK_SHARED ){
      if( p->nWrLock ){
        rc = SQLITE_BUSY;
      }else{
        p->nWrLock = 1;
      }
    }
  }else if( eLock==SQLITE_LOCK_SHARED ){
    if( pThis->eLock > SQLITE_LOCK_SHARED ){
      assert( p->nWrLock==1 );
      p->nWrLock = 0;
    }else if( p->nWrLock ){
      rc = SQLITE_BUSY;
    }else{
      p->nRdLock++;
    }
  }else{
    assert( eLock==SQLITE_LOCK_NONE );
    if( pThis->eLock>SQLITE_LOCK_SHARED ){
      assert( p->nWrLock==1 );
      p->nWrLock = 0;
    }
    assert( p->nRdLock>0 );
    p->nRdLock--;
  }
  if( rc==SQLITE_OK ) pThis->eLock = eLock;
  memdbLeave(p);
  return rc;
}

#if 0
/*
** This interface is only used for crash recovery, which does not
** occur on an in-memory database.
*/
static int memdbCheckReservedLock(sqlite3_file *pFile, int *pResOut){
  *pResOut = 0;
  return SQLITE_OK;
}
#endif


/*
** File control method. For custom operations on an memdb-file.
*/
static int memdbFileControl(sqlite3_file *pFile, int op, void *pArg){
  MemStore *p = ((MemFile*)pFile)->pStore;
  int rc = SQLITE_NOTFOUND;
  memdbEnter(p);
  if( op==SQLITE_FCNTL_VFSNAME ){
    *(char**)pArg = sqlite3_mprintf("memdb(%p,%lld)", p->aData, p->sz);
    rc = SQLITE_OK;
  }
  if( op==SQLITE_FCNTL_SIZE_LIMIT ){
    sqlite3_int64 iLimit = *(sqlite3_int64*)pArg;
    if( iLimit<p->sz ){
      if( iLimit<0 ){
        iLimit = p->szMax;
      }else{
        iLimit = p->sz;
      }
    }
    p->szMax = iLimit;
    *(sqlite3_int64*)pArg = iLimit;
    rc = SQLITE_OK;
  }
  memdbLeave(p);
  return rc;
}

#if 0  /* Not used because of SQLITE_IOCAP_POWERSAFE_OVERWRITE */
/*
** Return the sector-size in bytes for an memdb-file.
*/

/* Fetch a page of a memory-mapped file */
static int memdbFetch(
  sqlite3_file *pFile,
  sqlite3_int64 iOfst,
  int iAmt,
  void **pp
){
  MemStore *p = ((MemFile*)pFile)->pStore;
  memdbEnter(p);
  if( iOfst+iAmt>p->sz ){
    *pp = 0;
  }else{
    p->nMmap++;
    *pp = (void*)(p->aData + iOfst);
  }
  memdbLeave(p);
  return SQLITE_OK;
}

/* Release a memory-mapped page */
static int memdbUnfetch(sqlite3_file *pFile, sqlite3_int64 iOfst, void *pPage){
  MemStore *p = ((MemFile*)pFile)->pStore;
  memdbEnter(p);
  p->nMmap--;
  memdbLeave(p);
  return SQLITE_OK;
}

/*
** Open an mem file handle.
*/
static int memdbOpen(
  sqlite3_vfs *pVfs,
  const char *zName,
  sqlite3_file *pFd,
  int flags,
  int *pOutFlags
){
  MemFile *pFile = (MemFile*)pFd;
  MemStore *p = 0;
  int szName;
  if( (flags & SQLITE_OPEN_MAIN_DB)==0 ){
    return ORIGVFS(pVfs)->xOpen(ORIGVFS(pVfs), zName, pFd, flags, pOutFlags);
  }
  memset(pFile, 0, sizeof(*p));
  szName = sqlite3Strlen30(zName);
  if( szName>1 && zName[0]=='/' ){
    int i;
#ifndef SQLITE_MUTEX_OMIT
    sqlite3_mutex *pVfsMutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_VFS1);
#endif
    sqlite3_mutex_enter(pVfsMutex);
    for(i=0; i<memdb_g.nMemStore; i++){
      if( strcmp(memdb_g.apMemStore[i]->zFName,zName)==0 ){
        p = memdb_g.apMemStore[i];
        break;
      }
    }
    if( p==0 ){
      MemStore **apNew;
      p = sqlite3Malloc( sizeof(*p) + szName + 3 );
      if( p==0 ){
        sqlite3_mutex_leave(pVfsMutex);
        return SQLITE_NOMEM;
      }
      apNew = sqlite3Realloc(memdb_g.apMemStore,
                             sizeof(apNew[0])*(memdb_g.nMemStore+1) );
      if( apNew==0 ){
        sqlite3_free(p);
        sqlite3_mutex_leave(pVfsMutex);
        return SQLITE_NOMEM;
      }
      apNew[memdb_g.nMemStore++] = p;
      memdb_g.apMemStore = apNew;
      memset(p, 0, sizeof(*p));
      p->mFlags = SQLITE_DESERIALIZE_RESIZEABLE|SQLITE_DESERIALIZE_FREEONCLOSE;
      p->szMax = sqlite3GlobalConfig.mxMemdbSize;
      p->zFName = (char*)&p[1];
      memcpy(p->zFName, zName, szName+1);
      p->pMutex = sqlite3_mutex_alloc(SQLITE_MUTEX_FAST);
      if( p->pMutex==0 ){
        memdb_g.nMemStore--;
        sqlite3_free(p);
        sqlite3_mutex_leave(pVfsMutex);
        return SQLITE_NOMEM;
      }
      p->nRef = 1;
      memdbEnter(p);
    }else{
      memdbEnter(p);
      p->nRef++;
    }
    sqlite3_mutex_leave(pVfsMutex);
  }else{
    p = sqlite3Malloc( sizeof(*p) );
    if( p==0 ){
      return SQLITE_NOMEM;
    }
    memset(p, 0, sizeof(*p));
    p->mFlags = SQLITE_DESERIALIZE_RESIZEABLE | SQLITE_DESERIALIZE_FREEONCLOSE;
    p->szMax = sqlite3GlobalConfig.mxMemdbSize;
  }
  pFile->pStore = p;
  assert( pOutFlags!=0 );  /* True because flags==SQLITE_OPEN_MAIN_DB */
  *pOutFlags = flags | SQLITE_OPEN_MEMORY;
  pFd->pMethods = &memdb_io_methods;
  memdbLeave(p);
  return SQLITE_OK;
}

#if 0 /* Only used to delete rollback journals, super-journals, and WAL
      ** files, none of which exist in memdb.  So this routine is never used */
/*
** Delete the file located at zPath. If the dirSync argument is true,

/*
** Translate a database connection pointer and schema name into a
** MemFile pointer.
*/
static MemFile *memdbFromDbSchema(sqlite3 *db, const char *zSchema){
  MemFile *p = 0;
  MemStore *pStore;
  int rc = sqlite3_file_control(db, zSchema, SQLITE_FCNTL_FILE_POINTER, &p);
  if( rc ) return 0;
  if( p->base.pMethods!=&memdb_io_methods ) return 0;
  pStore = p->pStore;
  memdbEnter(pStore);
  if( pStore->zFName!=0 ) p = 0;
  memdbLeave(pStore);
  return p;
}

/*
** Return the serialization of a database
*/
SQLITE_API unsigned char *sqlite3_serialize(

  if( zSchema==0 ) zSchema = db->aDb[0].zDbSName;
  p = memdbFromDbSchema(db, zSchema);
  iDb = sqlite3FindDbName(db, zSchema);
  if( piSize ) *piSize = -1;
  if( iDb<0 ) return 0;
  if( p ){
    MemStore *pStore = p->pStore;
    assert( pStore->pMutex==0 );
    if( piSize ) *piSize = pStore->sz;
    if( mFlags & SQLITE_SERIALIZE_NOCOPY ){
      pOut = pStore->aData;
    }else{
      pOut = sqlite3_malloc64( pStore->sz );
      if( pOut ) memcpy(pOut, pStore->aData, pStore->sz);
    }
    return pOut;
  }
  pBt = db->aDb[iDb].pBt;
  if( pBt==0 ) return 0;
  szPage = sqlite3BtreeGetPageSize(pBt);
  zSql = sqlite3_mprintf("PRAGMA \"%w\".page_count", zSchema);

    rc = SQLITE_ERROR;
    goto end_deserialize;
  }
  p = memdbFromDbSchema(db, zSchema);
  if( p==0 ){
    rc = SQLITE_ERROR;
  }else{
    MemStore *pStore = p->pStore;
    pStore->aData = pData;
    pData = 0;
    pStore->sz = szDb;
    pStore->szAlloc = szBuf;
    pStore->szMax = szBuf;
    if( pStore->szMax<sqlite3GlobalConfig.mxMemdbSize ){
      pStore->szMax = sqlite3GlobalConfig.mxMemdbSize;
    }
    pStore->mFlags = mFlags;
    rc = SQLITE_OK;
  }

end_deserialize:
  sqlite3_finalize(pStmt);
  if( pData && (mFlags & SQLITE_DESERIALIZE_FREEONCLOSE)!=0 ){
    sqlite3_free(pData);

  ** Windows x86 and SQLITE_MAX_MMAP_SIZE=0.  We always leave
  ** it in, to be safe, but it is marked as NO_TEST since there
  ** is no way to reach it under most builds. */
  if( sz<sizeof(MemFile) ) sz = sizeof(MemFile); /*NO_TEST*/
  memdb_vfs.szOsFile = sz;
  return sqlite3_vfs_register(&memdb_vfs, 0);
}
#endif /* SQLITE_OMIT_DESERIALIZE */

/************** End of memdb.c ***********************************************/
/************** Begin file bitvec.c ******************************************/
/*
** 2008 February 16
**
** The author disclaims copyright to this source code.  In place of

  void (*xReinit)(DbPage*) /* Function to reinitialize pages */
){
  u8 *pPtr;
  Pager *pPager = 0;       /* Pager object to allocate and return */
  int rc = SQLITE_OK;      /* Return code */
  int tempFile = 0;        /* True for temp files (incl. in-memory files) */
  int memDb = 0;           /* True if this is an in-memory file */
#ifndef SQLITE_OMIT_DESERIALIZE
  int memJM = 0;           /* Memory journal mode */
#else
# define memJM 0
#endif
  int readOnly = 0;        /* True if this is a read-only file */
  int journalFileSize;     /* Bytes to allocate for each journal fd */
  char *zPathname = 0;     /* Full path to database file */

  /* Open the pager file.
  */
  if( zFilename && zFilename[0] ){
    int fout = 0;                    /* VFS flags returned by xOpen() */
    rc = sqlite3OsOpen(pVfs, pPager->zFilename, pPager->fd, vfsFlags, &fout);
    assert( !memDb );
#ifndef SQLITE_OMIT_DESERIALIZE
    memJM = (fout&SQLITE_OPEN_MEMORY)!=0;
#endif
    readOnly = (fout&SQLITE_OPEN_READONLY)!=0;

    /* If the file was successfully opened for read/write access,
    ** choose a default page size in case we have to create the
    ** database file. The default page size is the maximum of:

** actually needed.
*/
static void walCleanupHash(Wal *pWal){
  WalHashLoc sLoc;                /* Hash table location */
  int iLimit = 0;                 /* Zero values greater than this */
  int nByte;                      /* Number of bytes to zero in aPgno[] */
  int i;                          /* Used to iterate through aHash[] */


  assert( pWal->writeLock );
  testcase( pWal->hdr.mxFrame==HASHTABLE_NPAGE_ONE-1 );
  testcase( pWal->hdr.mxFrame==HASHTABLE_NPAGE_ONE );
  testcase( pWal->hdr.mxFrame==HASHTABLE_NPAGE_ONE+1 );

  if( pWal->hdr.mxFrame==0 ) return;

  /* Obtain pointers to the hash-table and page-number array containing
  ** the entry that corresponds to frame pWal->hdr.mxFrame. It is guaranteed
  ** that the page said hash-table and array reside on is already mapped.(1)
  */
  assert( pWal->nWiData>walFramePage(pWal->hdr.mxFrame) );
  assert( pWal->apWiData[walFramePage(pWal->hdr.mxFrame)] );
  i = walHashGet(pWal, walFramePage(pWal->hdr.mxFrame), &sLoc);
  if( NEVER(i) ) return; /* Defense-in-depth, in case (1) above is wrong */

  /* Zero all hash-table entries that correspond to frame numbers greater
  ** than pWal->hdr.mxFrame.
  */
  iLimit = pWal->hdr.mxFrame - sLoc.iZero;
  assert( iLimit>0 );
  for(i=0; i<HASHTABLE_NSLOT; i++){

      if( pFree!=(pCell + sz) ){
        if( pFree ){
          assert( pFree>aData && (pFree - aData)<65536 );
          freeSpace(pPg, (u16)(pFree - aData), szFree);
        }
        pFree = pCell;
        szFree = sz;
        if( pFree+sz>pEnd ){
          return 0;
        }
      }else{
        pFree = pCell;
        szFree += sz;
      }
      nRet++;
    }
  }

  }

  /* Insert new divider cells into pParent. */
  for(i=0; i<nNew-1; i++){
    u8 *pCell;
    u8 *pTemp;
    int sz;
    u8 *pSrcEnd;
    MemPage *pNew = apNew[i];
    j = cntNew[i];

    assert( j<nMaxCells );
    assert( b.apCell[j]!=0 );
    pCell = b.apCell[j];
    sz = b.szCell[j] + leafCorrection;

        assert(leafCorrection==4);
        sz = pParent->xCellSize(pParent, pCell);
      }
    }
    iOvflSpace += sz;
    assert( sz<=pBt->maxLocal+23 );
    assert( iOvflSpace <= (int)pBt->pageSize );
    for(k=0; b.ixNx[k]<=i && ALWAYS(k<NB*2); k++){}
    pSrcEnd = b.apEnd[k];
    if( SQLITE_WITHIN(pSrcEnd, pCell, pCell+sz) ){
      rc = SQLITE_CORRUPT_BKPT;
      goto balance_cleanup;
    }
    insertCell(pParent, nxDiv+i, pCell, sz, pTemp, pNew->pgno, &rc);
    if( rc!=SQLITE_OK ) goto balance_cleanup;
    assert( sqlite3PagerIswriteable(pParent->pDbPage) );
  }

  /* Now update the actual sibling pages. The order in which they are updated
  ** is important, as this code needs to avoid disrupting any page from which

  memTracePrint(p);
  if( p->pScopyFrom ){
    printf(" <== R[%d]", (int)(p->pScopyFrom - &p[-iReg]));
  }
  printf("\n");
  sqlite3VdbeCheckMemInvariants(p);
}
SQLITE_PRIVATE void sqlite3PrintMem(Mem *pMem){
  memTracePrint(pMem);
  printf("\n");
  fflush(stdout);
}
#endif

#ifdef SQLITE_DEBUG
/*
** Show the values of all registers in the virtual machine.  Used for
** interactive debugging.
*/

case OP_SeekHit: {
  VdbeCursor *pC;
  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  pC = p->apCsr[pOp->p1];
  assert( pC!=0 );
  assert( pOp->p3>=pOp->p2 );
  if( pC->seekHit<pOp->p2 ){
#ifdef SQLITE_DEBUG
    if( db->flags&SQLITE_VdbeTrace ){
      printf("seekHit changes from %d to %d\n", pC->seekHit, pOp->p2);
    }
#endif
    pC->seekHit = pOp->p2;
  }else if( pC->seekHit>pOp->p3 ){
#ifdef SQLITE_DEBUG
    if( db->flags&SQLITE_VdbeTrace ){
      printf("seekHit changes from %d to %d\n", pC->seekHit, pOp->p3);
    }
#endif
    pC->seekHit = pOp->p3;
  }
  break;
}

/* Opcode: IfNotOpen P1 P2 * * *
** Synopsis: if( !csr[P1] ) goto P2

** See also: NotFound, Found, NotExists
*/
case OP_IfNoHope: {     /* jump, in3 */
  VdbeCursor *pC;
  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  pC = p->apCsr[pOp->p1];
  assert( pC!=0 );
#ifdef SQLITE_DEBUG
  if( db->flags&SQLITE_VdbeTrace ){
    printf("seekHit is %d\n", pC->seekHit);
  }
#endif
  if( pC->seekHit>=pOp->p4.i ) break;
  /* Fall through into OP_NotFound */
  /* no break */ deliberate_fall_through
}
case OP_NoConflict:     /* jump, in3 */
case OP_NotFound:       /* jump, in3 */
case OP_Found: {        /* jump, in3 */

*/
SQLITE_PRIVATE Expr *sqlite3ExprAddCollateToken(
  Parse *pParse,           /* Parsing context */
  Expr *pExpr,             /* Add the "COLLATE" clause to this expression */
  const Token *pCollName,  /* Name of collating sequence */
  int dequote              /* True to dequote pCollName */
){











  if( pCollName->n>0 ){
    Expr *pNew = sqlite3ExprAlloc(pParse->db, TK_COLLATE, pCollName, dequote);
    if( pNew ){
      pNew->pLeft = pExpr;
      pNew->flags |= EP_Collate|EP_Skip;
      pExpr = pNew;
    }
  }

/*
** Walker callback used by sqlite3RenameExprUnmap().
*/
static int renameUnmapSelectCb(Walker *pWalker, Select *p){
  Parse *pParse = pWalker->pParse;
  int i;
  if( pParse->nErr ) return WRC_Abort;
  if( p->selFlags & SF_View ) return WRC_Prune;
  if( ALWAYS(p->pEList) ){
    ExprList *pList = p->pEList;
    for(i=0; i<pList->nExpr; i++){
      if( pList->a[i].zEName && pList->a[i].eEName==ENAME_NAME ){
        sqlite3RenameTokenRemap(pParse, 0, (void*)pList->a[i].zEName);
      }
    }

  UNUSED_PARAMETER(NotUsed);
  zFile = (const char *)sqlite3_value_text(argv[0]);
  zName = (const char *)sqlite3_value_text(argv[1]);
  if( zFile==0 ) zFile = "";
  if( zName==0 ) zName = "";

#ifndef SQLITE_OMIT_DESERIALIZE
# define REOPEN_AS_MEMDB(db)  (db->init.reopenMemdb)
#else
# define REOPEN_AS_MEMDB(db)  (0)
#endif

  if( REOPEN_AS_MEMDB(db) ){
    /* This is not a real ATTACH.  Instead, this routine is being called

    return pTab->nNVCol + i - n;
  }else{
    /* iCol is a normal or stored column */
    return n;
  }
}
#endif

/*
** Insert a single OP_JournalMode query opcode in order to force the
** prepared statement to return false for sqlite3_stmt_readonly().  This
** is used by CREATE TABLE IF NOT EXISTS and similar if the table already
** exists, so that the prepared statement for CREATE TABLE IF NOT EXISTS
** will return false for sqlite3_stmt_readonly() even if that statement
** is a read-only no-op.
*/
static void sqlite3ForceNotReadOnly(Parse *pParse){
  int iReg = ++pParse->nMem;
  Vdbe *v = sqlite3GetVdbe(pParse);
  if( v ){
    sqlite3VdbeAddOp3(v, OP_JournalMode, 0, iReg, PAGER_JOURNALMODE_QUERY);
  }
}

/*
** Begin constructing a new table representation in memory.  This is
** the first of several action routines that get called in response
** to a CREATE TABLE statement.  In particular, this routine is called
** after seeing tokens "CREATE" and "TABLE" and the table name. The isTemp
** flag is true if the table should be stored in the auxiliary database

    pTable = sqlite3FindTable(db, zName, zDb);
    if( pTable ){
      if( !noErr ){
        sqlite3ErrorMsg(pParse, "table %T already exists", pName);
      }else{
        assert( !db->init.busy || CORRUPT_DB );
        sqlite3CodeVerifySchema(pParse, iDb);
        sqlite3ForceNotReadOnly(pParse);
      }
      goto begin_table_error;
    }
    if( sqlite3FindIndex(db, zName, zDb)!=0 ){
      sqlite3ErrorMsg(pParse, "there is already an index named %s", zName);
      goto begin_table_error;
    }

  if( sqlite3ReadSchema(pParse) ) goto exit_drop_table;
  if( noErr ) db->suppressErr++;
  assert( isView==0 || isView==LOCATE_VIEW );
  pTab = sqlite3LocateTableItem(pParse, isView, &pName->a[0]);
  if( noErr ) db->suppressErr--;

  if( pTab==0 ){
    if( noErr ){
      sqlite3CodeVerifyNamedSchema(pParse, pName->a[0].zDatabase);
      sqlite3ForceNotReadOnly(pParse);
    }
    goto exit_drop_table;
  }
  iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
  assert( iDb>=0 && iDb<db->nDb );

  /* If pTab is a virtual table, call ViewGetColumnNames() to ensure
  ** it is initialized.

      }
      if( sqlite3FindIndex(db, zName, pDb->zDbSName)!=0 ){
        if( !ifNotExist ){
          sqlite3ErrorMsg(pParse, "index %s already exists", zName);
        }else{
          assert( !db->init.busy );
          sqlite3CodeVerifySchema(pParse, iDb);
          sqlite3ForceNotReadOnly(pParse);
        }
        goto exit_create_index;
      }
    }
  }else{
    int n;
    Index *pLoop;

  ** stat1 data to be ignored by the query planner.
  */
  x = pIdx->pTable->nRowLogEst;
  assert( 99==sqlite3LogEst(1000) );
  if( x<99 ){
    pIdx->pTable->nRowLogEst = x = 99;
  }
  if( pIdx->pPartIdxWhere!=0 ){ x -= 10;  assert( 10==sqlite3LogEst(2) ); }
  a[0] = x;

  /* Estimate that a[1] is 10, a[2] is 9, a[3] is 8, a[4] is 7, a[5] is
  ** 6 and each subsequent value (if any) is 5.  */
  memcpy(&a[1], aVal, nCopy*sizeof(LogEst));
  for(i=nCopy+1; i<=pIdx->nKeyCol; i++){
    a[i] = 23;                    assert( 23==sqlite3LogEst(5) );

  }
  pIndex = sqlite3FindIndex(db, pName->a[0].zName, pName->a[0].zDatabase);
  if( pIndex==0 ){
    if( !ifExists ){
      sqlite3ErrorMsg(pParse, "no such index: %S", pName->a);
    }else{
      sqlite3CodeVerifyNamedSchema(pParse, pName->a[0].zDatabase);
      sqlite3ForceNotReadOnly(pParse);
    }
    pParse->checkSchema = 1;
    goto exit_drop_index;
  }
  if( pIndex->idxType!=SQLITE_IDXTYPE_APPDEF ){
    sqlite3ErrorMsg(pParse, "index associated with UNIQUE "
      "or PRIMARY KEY constraint cannot be dropped", 0);

** Find all terms of COLUMN=VALUE or VALUE=COLUMN in pExpr where VALUE
** is a constant expression and where the term must be true because it
** is part of the AND-connected terms of the expression.  For each term
** found, add it to the pConst structure.
*/
static void findConstInWhere(WhereConst *pConst, Expr *pExpr){
  Expr *pRight, *pLeft;
  if( NEVER(pExpr==0) ) return;
  if( ExprHasProperty(pExpr, EP_FromJoin) ) return;
  if( pExpr->op==TK_AND ){
    findConstInWhere(pConst, pExpr->pRight);
    findConstInWhere(pConst, pExpr->pLeft);
    return;
  }
  if( pExpr->op!=TK_EQ ) return;

#endif

  /* Do the WHERE-clause constant propagation optimization if this is
  ** a join.  No need to speed time on this operation for non-join queries
  ** as the equivalent optimization will be handled by query planner in
  ** sqlite3WhereBegin().
  */
  if( p->pWhere!=0
   && p->pWhere->op==TK_AND
   && OptimizationEnabled(db, SQLITE_PropagateConst)
   && propagateConstants(pParse, p)
  ){
#if SELECTTRACE_ENABLED
    if( sqlite3SelectTrace & 0x100 ){
      SELECTTRACE(0x100,pParse,p,("After constant propagation:\n"));
      sqlite3TreeViewSelect(0, p, 0);

*/
struct WhereScan {
  WhereClause *pOrigWC;      /* Original, innermost WhereClause */
  WhereClause *pWC;          /* WhereClause currently being scanned */
  const char *zCollName;     /* Required collating sequence, if not NULL */
  Expr *pIdxExpr;            /* Search for this index expression */
  char idxaff;               /* Must match this affinity, if zCollName!=NULL */
  unsigned char nEquiv;      /* Number of entries in aiCur[] and aiColumn[] */
  unsigned char iEquiv;      /* Next unused slot in aiCur[] and aiColumn[] */
  u32 opMask;                /* Acceptable operators */
  int k;                     /* Resume scanning at this->pWC->a[this->k] */
  int aiCur[11];             /* Cursors in the equivalence class */
  i16 aiColumn[11];          /* Corresponding column number in the eq-class */
};

/*

#define WHERE_AUTO_INDEX   0x00004000  /* Uses an ephemeral index */
#define WHERE_SKIPSCAN     0x00008000  /* Uses the skip-scan algorithm */
#define WHERE_UNQ_WANTED   0x00010000  /* WHERE_ONEROW would have been helpful*/
#define WHERE_PARTIALIDX   0x00020000  /* The automatic index is partial */
#define WHERE_IN_EARLYOUT  0x00040000  /* Perhaps quit IN loops early */
#define WHERE_BIGNULL_SORT 0x00080000  /* Column nEq of index is BIGNULL */
#define WHERE_IN_SEEKSCAN  0x00100000  /* Seek-scan optimization for IN */
#define WHERE_TRANSCONS    0x00200000  /* Uses a transitive constraint */

#endif /* !defined(SQLITE_WHEREINT_H) */

/************** End of whereInt.h ********************************************/
/************** Continuing where we left off in wherecode.c ******************/

#ifndef SQLITE_OMIT_EXPLAIN

      && (pLevel->notReady & pTerm->prereqAll)==0
  ){
    if( nLoop && (pTerm->wtFlags & TERM_LIKE)!=0 ){
      pTerm->wtFlags |= TERM_LIKECOND;
    }else{
      pTerm->wtFlags |= TERM_CODED;
    }
#ifdef WHERETRACE_ENABLED
    if( sqlite3WhereTrace & 0x20000 ){
      sqlite3DebugPrintf("DISABLE-");
      sqlite3WhereTermPrint(pTerm, (int)(pTerm - (pTerm->pWC->a)));
    }
#endif
    if( pTerm->iParent<0 ) break;
    pTerm = &pTerm->pWC->a[pTerm->iParent];
    assert( pTerm!=0 );
    pTerm->nChild--;
    if( pTerm->nChild!=0 ) break;
    nLoop++;
  }

      }
    }else{
      pLevel->u.in.nIn = 0;
    }
    sqlite3DbFree(pParse->db, aiMap);
#endif
  }

  /* As an optimization, try to disable the WHERE clause term that is
  ** driving the index as it will always be true.  The correct answer is
  ** obtained regardless, but we might get the answer with fewer CPU cycles
  ** by omitting the term.
  **
  ** But do not disable the term unless we are certain that the term is
  ** not a transitive constraint.  For an example of where that does not
  ** work, see https://sqlite.org/forum/forumpost/eb8613976a (2021-05-04)
  */
  if( (pLevel->pWLoop->wsFlags & WHERE_TRANSCONS)==0
   || (pTerm->eOperator & WO_EQUIV)==0
  ){
    disableTerm(pLevel, pTerm);
  }

  return iReg;
}

/*
** Generate code that will evaluate all == and IN constraints for an
** index scan.
**

      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).
    */
    if( (nEq<pIdx->nColumn && bRev==(pIdx->aSortOrder[nEq]==SQLITE_SO_ASC)) ){


      SWAP(WhereTerm *, pRangeEnd, pRangeStart);
      SWAP(u8, bSeekPastNull, bStopAtNull);
      SWAP(u8, nBtm, nTop);
    }

    if( iLevel>0 && (pLoop->wsFlags & WHERE_IN_SEEKSCAN)!=0 ){
      /* In case OP_SeekScan is used, ensure that the index cursor does not

        int idxNew;
        transferJoinMarkings(pNew, pExpr);
        assert( !ExprHasProperty(pNew, EP_xIsSelect) );
        pNew->x.pList = pList;
        idxNew = whereClauseInsert(pWC, pNew, TERM_VIRTUAL|TERM_DYNAMIC);
        testcase( idxNew==0 );
        exprAnalyze(pSrc, pWC, idxNew);
        /* pTerm = &pWC->a[idxTerm]; // would be needed if pTerm where reused */
        markTermAsChild(pWC, idxNew, idxTerm);
      }else{
        sqlite3ExprListDelete(db, pList);
      }
    }
  }
}

  ** inequality constraint (>, <, >= or <=), perform the processing
  ** on the first element of the vector.  */
  assert( TK_GT+1==TK_LE && TK_GT+2==TK_LT && TK_GT+3==TK_GE );
  assert( TK_IS<TK_GE && TK_ISNULL<TK_GE && TK_IN<TK_GE );
  assert( op<=TK_GE );
  if( pExpr->op==TK_VECTOR && (op>=TK_GT && ALWAYS(op<=TK_GE)) ){
    pExpr = pExpr->x.pList->a[0].pExpr;

  }

  if( pExpr->op==TK_COLUMN ){
    aiCurCol[0] = pExpr->iTable;
    aiCurCol[1] = pExpr->iColumn;
    return 1;
  }
  if( mPrereq==0 ) return 0;                 /* No table references */
  if( (mPrereq&(mPrereq-1))!=0 ) return 0;   /* Refs more than one table */
  return exprMightBeIndexed2(pFrom,mPrereq,aiCurCol,pExpr);
}
















































































































































































































































































/*
** The input to this routine is an WhereTerm structure with only the
** "pExpr" field filled in.  The job of this routine is to analyze the
** subexpression and populate all the other fields of the WhereTerm
** structure.
**

      pTerm->leftCursor = aiCurCol[0];
      pTerm->u.x.leftColumn = aiCurCol[1];
      pTerm->eOperator = operatorMask(op) & opMask;
    }
    if( op==TK_IS ) pTerm->wtFlags |= TERM_IS;
    if( pRight
     && exprMightBeIndexed(pSrc, pTerm->prereqRight, aiCurCol, pRight, op)
     && !ExprHasProperty(pRight, EP_FixedCol)
    ){
      WhereTerm *pNew;
      Expr *pDup;
      u16 eExtraOp = 0;        /* Extra bits for pNew->eOperator */
      assert( pTerm->u.x.iField==0 );
      if( pTerm->leftCursor>=0 ){
        int idxNew;

  */
  else if( pExpr->op==TK_OR ){
    assert( pWC->op==TK_AND );
    exprAnalyzeOrTerm(pSrc, pWC, idxTerm);
    pTerm = &pWC->a[idxTerm];
  }
#endif /* SQLITE_OMIT_OR_OPTIMIZATION */










  /* The form "x IS NOT NULL" can sometimes be evaluated more efficiently
  ** as "x>NULL" if x is not an INTEGER PRIMARY KEY.  So construct a
  ** virtual term of that form.
  **
  ** The virtual term must be tagged with TERM_VNULL.
  */
  else if( pExpr->op==TK_NOTNULL ){

             && pX->iColumn==pScan->aiColumn[0]
            ){
              testcase( pTerm->eOperator & WO_IS );
              continue;
            }
            pScan->pWC = pWC;
            pScan->k = k+1;
#ifdef WHERETRACE_ENABLED
            if( sqlite3WhereTrace & 0x20000 ){
              int ii;
              sqlite3DebugPrintf("SCAN-TERM %p: nEquiv=%d",
                 pTerm, pScan->nEquiv);
              for(ii=0; ii<pScan->nEquiv; ii++){
                sqlite3DebugPrintf(" {%d:%d}",
                   pScan->aiCur[ii], pScan->aiColumn[ii]);
              }
              sqlite3DebugPrintf("\n");
            }
#endif
            return pTerm;
          }
        }
      }
      pWC = pWC->pOuter;
      k = 0;
    }while( pWC!=0 );

  }else{
    assert( pNew->u.btree.nBtm==0 );
    opMask = WO_EQ|WO_IN|WO_GT|WO_GE|WO_LT|WO_LE|WO_ISNULL|WO_IS;
  }
  if( pProbe->bUnordered ) opMask &= ~(WO_GT|WO_GE|WO_LT|WO_LE);

  assert( pNew->u.btree.nEq<pProbe->nColumn );
  assert( pNew->u.btree.nEq<pProbe->nKeyCol
       || pProbe->idxType!=SQLITE_IDXTYPE_PRIMARYKEY );

  saved_nEq = pNew->u.btree.nEq;
  saved_nBtm = pNew->u.btree.nBtm;
  saved_nTop = pNew->u.btree.nTop;
  saved_nSkip = pNew->nSkip;
  saved_nLTerm = pNew->nLTerm;
  saved_wsFlags = pNew->wsFlags;

         || (pProbe->nKeyCol==1 && pProbe->onError && eOp==WO_EQ)
        ){
          pNew->wsFlags |= WHERE_ONEROW;
        }else{
          pNew->wsFlags |= WHERE_UNQ_WANTED;
        }
      }
      if( scan.iEquiv>1 ) pNew->wsFlags |= WHERE_TRANSCONS;
    }else if( eOp & WO_ISNULL ){
      pNew->wsFlags |= WHERE_COLUMN_NULL;
    }else if( eOp & (WO_GT|WO_GE) ){
      testcase( eOp & WO_GT );
      testcase( eOp & WO_GE );
      pNew->wsFlags |= WHERE_COLUMN_RANGE|WHERE_BTM_LIMIT;
      pNew->u.btree.nBtm = whereRangeVectorLen(

      pNew->nOut = saved_nOut;
    }else{
      pNew->nOut = nOutUnadjusted;
    }

    if( (pNew->wsFlags & WHERE_TOP_LIMIT)==0
     && pNew->u.btree.nEq<pProbe->nColumn
     && (pNew->u.btree.nEq<pProbe->nKeyCol ||
           pProbe->idxType!=SQLITE_IDXTYPE_PRIMARYKEY)
    ){
      whereLoopAddBtreeIndex(pBuilder, pSrc, pProbe, nInMul+nIn);
    }
    pNew->nOut = saved_nOut;
#ifdef SQLITE_ENABLE_STAT4
    pBuilder->nRecValid = nRecValid;
#endif

  ** rows, so fudge it downwards a bit.
  */
  if( (pWInfo->wctrlFlags & WHERE_USE_LIMIT)!=0 && pWInfo->iLimit<nRow ){
    nRow = pWInfo->iLimit;
  }else if( (pWInfo->wctrlFlags & WHERE_WANT_DISTINCT) ){
    /* TUNING: In the sort for a DISTINCT operator, assume that the DISTINCT
    ** reduces the number of output rows by a factor of 2 */
    if( nRow>10 ){ nRow -= 10;  assert( 10==sqlite3LogEst(2) ); }
  }
  rSortCost += estLog(nRow);
  return rSortCost;
}

/*
** Given the list of WhereLoop objects at pWInfo->pLoops, this routine

      sqlite3VdbeResolveLabel(v, pLevel->addrCont);
    }
    if( pLoop->wsFlags & WHERE_IN_ABLE && pLevel->u.in.nIn>0 ){
      struct InLoop *pIn;
      int j;
      sqlite3VdbeResolveLabel(v, pLevel->addrNxt);
      for(j=pLevel->u.in.nIn, pIn=&pLevel->u.in.aInLoop[j-1]; j>0; j--, pIn--){
        assert( sqlite3VdbeGetOp(v, pIn->addrInTop+1)->opcode==OP_IsNull
                 || pParse->db->mallocFailed );
        sqlite3VdbeJumpHere(v, pIn->addrInTop+1);
        if( pIn->eEndLoopOp!=OP_Noop ){
          if( pIn->nPrefix ){
            int bEarlyOut =
                (pLoop->wsFlags & WHERE_VIRTUALTABLE)==0
                 && (pLoop->wsFlags & WHERE_IN_EARLYOUT)!=0;
            if( pLevel->iLeftJoin ){

              VdbeCoverage(v);
            }
            if( bEarlyOut ){
              sqlite3VdbeAddOp4Int(v, OP_IfNoHope, pLevel->iIdxCur,
                  sqlite3VdbeCurrentAddr(v)+2,
                  pIn->iBase, pIn->nPrefix);
              VdbeCoverage(v);
              /* Retarget the OP_IsNull against the left operand of IN so
              ** it jumps past the OP_IfNoHope.  This is because the
              ** OP_IsNull also bypasses the OP_Affinity opcode that is
              ** required by OP_IfNoHope. */
              sqlite3VdbeJumpHere(v, pIn->addrInTop+1);
            }
          }
          sqlite3VdbeAddOp2(v, pIn->eEndLoopOp, pIn->iCur, pIn->addrInTop);
          VdbeCoverage(v);
          VdbeCoverageIf(v, pIn->eEndLoopOp==OP_Prev);
          VdbeCoverageIf(v, pIn->eEndLoopOp==OP_Next);
        }

  if( pExpr->op==TK_AGG_FUNCTION
   && pExpr->op2>=pWalker->walkerDepth
  ){
    pExpr->op2++;
  }
  return WRC_Continue;
}

static int disallowAggregatesInOrderByCb(Walker *pWalker, Expr *pExpr){
  if( pExpr->op==TK_AGG_FUNCTION && pExpr->pAggInfo==0 ){
    sqlite3ErrorMsg(pWalker->pParse,
         "misuse of aggregate: %s()", pExpr->u.zToken);
  }
  return WRC_Continue;
}

/*
** If the SELECT statement passed as the second argument does not invoke
** any SQL window functions, this function is a no-op. Otherwise, it
** rewrites the SELECT statement so that window function xStep functions
** are invoked in the correct order as described under "SELECT REWRITING"
** at the top of this file.

    pTab = sqlite3DbMallocZero(db, sizeof(Table));
    if( pTab==0 ){
      return sqlite3ErrorToParser(db, SQLITE_NOMEM);
    }
    sqlite3AggInfoPersistWalkerInit(&w, pParse);
    sqlite3WalkSelect(&w, p);
    if( (p->selFlags & SF_Aggregate)==0 ){
      w.xExprCallback = disallowAggregatesInOrderByCb;
      sqlite3WalkExprList(&w, p->pOrderBy);
    }

    p->pSrc = 0;
    p->pWhere = 0;
    p->pGroupBy = 0;
    p->pHaving = 0;
    p->selFlags &= ~SF_Aggregate;
    p->selFlags |= SF_WinRewrite;

    if( sqlite3GlobalConfig.isPCacheInit==0 ){
      rc = sqlite3PcacheInitialize();
    }
    if( rc==SQLITE_OK ){
      sqlite3GlobalConfig.isPCacheInit = 1;
      rc = sqlite3OsInit();
    }
#ifndef SQLITE_OMIT_DESERIALIZE
    if( rc==SQLITE_OK ){
      rc = sqlite3MemdbInit();
    }
#endif
    if( rc==SQLITE_OK ){
      sqlite3PCacheBufferSetup( sqlite3GlobalConfig.pPage,
          sqlite3GlobalConfig.szPage, sqlite3GlobalConfig.nPage);

        iVal = SQLITE_DEFAULT_SORTERREF_SIZE;
      }
      sqlite3GlobalConfig.szSorterRef = (u32)iVal;
      break;
    }
#endif /* SQLITE_ENABLE_SORTER_REFERENCES */

#ifndef SQLITE_OMIT_DESERIALIZE
    case SQLITE_CONFIG_MEMDB_MAXSIZE: {
      sqlite3GlobalConfig.mxMemdbSize = va_arg(ap, sqlite3_int64);
      break;
    }
#endif /* SQLITE_OMIT_DESERIALIZE */

    default: {
      rc = SQLITE_ERROR;
      break;
    }
  }
  va_end(ap);

){
  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 */
  u64 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
  ** root node, then the buffer comes from a SELECT statement. SQLite does
  ** not make this guarantee explicitly, but in practice there are always
  ** either more than 20 bytes of allocated space following the nNode bytes of
  ** contents, or two zero bytes. Or, if the node is read from the %_segments
  ** table, then there are always 20 bytes of zeroed padding following the
  ** nNode bytes of content (see sqlite3Fts3ReadBlock() for details).
  */
  zCsr += sqlite3Fts3GetVarintU(zCsr, &iChild);
  zCsr += sqlite3Fts3GetVarintU(zCsr, &iChild);
  if( zCsr>zEnd ){
    return FTS_CORRUPT_VTAB;
  }

  while( zCsr<zEnd && (piFirst || piLast) ){
    int cmp;                      /* memcmp() result */
    int nSuffix;                  /* Size of term suffix */

    ** iChild.
    **
    ** If the interior node term is larger than the specified term, then
    ** the tree headed by iChild may contain the specified term.
    */
    cmp = memcmp(zTerm, zBuffer, (nBuffer>nTerm ? nTerm : nBuffer));
    if( piFirst && (cmp<0 || (cmp==0 && nBuffer>nTerm)) ){
      *piFirst = (i64)iChild;
      piFirst = 0;
    }

    if( piLast && cmp<0 ){
      *piLast = (i64)iChild;
      piLast = 0;
    }

    iChild++;
  };

  if( piFirst ) *piFirst = (i64)iChild;
  if( piLast ) *piLast = (i64)iChild;

 finish_scan:
  sqlite3_free(zBuffer);
  return rc;
}

/* Append the N-byte string in zIn to the end of the JsonString string
** under construction.  Enclose the string in "..." and escape
** any double-quotes or backslash characters contained within the
** string.
*/
static void jsonAppendString(JsonString *p, const char *zIn, u32 N){
  u32 i;
  if( zIn==0 || ((N+p->nUsed+2 >= p->nAlloc) && jsonGrow(p,N+2)!=0) ) return;
  p->zBuf[p->nUsed++] = '"';
  for(i=0; i<N; i++){
    unsigned char c = ((unsigned const char*)zIn)[i];
    if( c=='"' || c=='\\' ){
      json_simple_escape:
      if( (p->nUsed+N+3-i > p->nAlloc) && jsonGrow(p,N+3-i)!=0 ) return;
      p->zBuf[p->nUsed++] = '\\';

          zSelect, pIter->zTbl, zOrder
        )
    );
    if( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pSel) ){
      zSep = "";
      for(iCol=0; iCol<pIter->nCol; iCol++){
        const char *zQuoted = (const char*)sqlite3_column_text(pSel, iCol);
        if( zQuoted==0 ){
          p->rc = SQLITE_NOMEM;
        }else if( zQuoted[0]=='N' ){
          bFailed = 1;
          break;
        }
        zVector = rbuMPrintf(p, "%z%s%s", zVector, zSep, zQuoted);
        zSep = ", ";
      }

      ** or xOpen() to operate on the *-wal file.  */
      pFd->zWal = sqlite3_filename_wal(zName);
    }
    else if( flags & SQLITE_OPEN_WAL ){
      rbu_file *pDb = rbuFindMaindb(pRbuVfs, zName, 0);
      if( pDb ){
        if( pDb->pRbu && pDb->pRbu->eStage==RBU_STAGE_OAL ){
          /* This call is to open a *-wal file. Intead, open the *-oal. */




          size_t nOpen;

          if( rbuIsVacuum(pDb->pRbu) ){
            zOpen = sqlite3_db_filename(pDb->pRbu->dbRbu, "main");
            zOpen = sqlite3_filename_wal(zOpen);
          }
          nOpen = strlen(zOpen);



          ((char*)zOpen)[nOpen-3] = 'o';






          pFd->pRbu = pDb->pRbu;
        }
        pDb->pWalFd = pFd;
      }
    }
  }else{
    pFd->pRbu = pRbuVfs->pRbu;

        if( pbNewTerm ) *pbNewTerm = 1;
      }
    }else{
      /* The following could be done by calling fts5SegIterLoadNPos(). But
      ** this block is particularly performance critical, so equivalent
      ** code is inlined.  */
      int nSz;

      assert_nc( pIter->iLeafOffset<=pIter->pLeaf->nn );
      fts5FastGetVarint32(pIter->pLeaf->p, pIter->iLeafOffset, nSz);
      pIter->bDel = (nSz & 0x0001);
      pIter->nPos = nSz>>1;
      assert_nc( pIter->nPos>=0 );
    }
  }

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: 2021-05-14 15:37:00 cf63abbe559d04f993f99a37d41ba4a97c0261094f1d4cc05cfa23b1e11731f5", -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__!=235094
#undef SQLITE_SOURCE_ID
#define SQLITE_SOURCE_ID      "2021-05-14 15:37:00 cf63abbe559d04f993f99a37d41ba4a97c0261094f1d4cc05cfa23b1e117alt2"
#endif
/* Return the source-id for this library */
SQLITE_API const char *sqlite3_sourceid(void){ return SQLITE_SOURCE_ID; }
/************************** End of sqlite3.c ******************************/

**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.36.0"
#define SQLITE_VERSION_NUMBER 3036000
#define SQLITE_SOURCE_ID      "2021-05-14 15:37:00 cf63abbe559d04f993f99a37d41ba4a97c0261094f1d4cc05cfa23b1e11731f5"

/*
** 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

** value of type (int). The integer value is set to 1 if the database is a wal
** mode database and there exists at least one client in another process that
** currently has an SQL transaction open on the database. It is set to 0 if
** the database is not a wal-mode db, or if there is no such connection in any
** other process. This opcode cannot be used to detect transactions opened
** by clients within the current process, only within other processes.
** </ul>
**
** <li>[[SQLITE_FCNTL_CKSM_FILE]]
** Used by the cksmvfs VFS module only.
** </ul>
*/
#define SQLITE_FCNTL_LOCKSTATE               1
#define SQLITE_FCNTL_GET_LOCKPROXYFILE       2
#define SQLITE_FCNTL_SET_LOCKPROXYFILE       3
#define SQLITE_FCNTL_LAST_ERRNO              4
#define SQLITE_FCNTL_SIZE_HINT               5
#define SQLITE_FCNTL_CHUNK_SIZE              6

#define SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE  33
#define SQLITE_FCNTL_LOCK_TIMEOUT           34
#define SQLITE_FCNTL_DATA_VERSION           35
#define SQLITE_FCNTL_SIZE_LIMIT             36
#define SQLITE_FCNTL_CKPT_DONE              37
#define SQLITE_FCNTL_RESERVE_BYTES          38
#define SQLITE_FCNTL_CKPT_START             39

#define SQLITE_FCNTL_EXTERNAL_READER        40
#define SQLITE_FCNTL_CKSM_FILE              41

/* deprecated names */
#define SQLITE_GET_LOCKPROXYFILE      SQLITE_FCNTL_GET_LOCKPROXYFILE
#define SQLITE_SET_LOCKPROXYFILE      SQLITE_FCNTL_SET_LOCKPROXYFILE
#define SQLITE_LAST_ERRNO             SQLITE_FCNTL_LAST_ERRNO

** sqlite3_stmt_readonly() to return true since, while those statements
** change the configuration of a database connection, they do not make
** changes to the content of the database files on disk.
** ^The sqlite3_stmt_readonly() interface returns true for [BEGIN] since
** [BEGIN] merely sets internal flags, but the [BEGIN|BEGIN IMMEDIATE] and
** [BEGIN|BEGIN EXCLUSIVE] commands do touch the database and so
** sqlite3_stmt_readonly() returns false for those commands.
**
** ^This routine returns false if there is any possibility that the
** statement might change the database file.  ^A false return does
** not guarantee that the statement will change the database file.
** ^For example, an UPDATE statement might have a WHERE clause that
** makes it a no-op, but the sqlite3_stmt_readonly() result would still
** be false.  ^Similarly, a CREATE TABLE IF NOT EXISTS statement is a
** read-only no-op if the table already exists, but
** sqlite3_stmt_readonly() still returns false for such a statement.
*/
SQLITE_API int sqlite3_stmt_readonly(sqlite3_stmt *pStmt);

/*
** CAPI3REF: Query The EXPLAIN Setting For A Prepared Statement
** METHOD: sqlite3_stmt
**

** that parameter must be the byte offset
** where the NUL terminator would occur assuming the string were NUL
** terminated.  If any NUL characters occurs at byte offsets less than
** the value of the fourth parameter then the resulting string value will
** contain embedded NULs.  The result of expressions involving strings
** with embedded NULs is undefined.
**
** ^The fifth argument to the BLOB and string binding interfaces controls
** or indicates the lifetime of the object referenced by the third parameter.
** ^These three options exist:
** ^(1) A destructor to dispose of the BLOB or string after SQLite has finished
** with it may be passed. ^It is called to dispose of the BLOB or string even
** if the call to the bind API fails, except the destructor is not called if
** the third parameter is a NULL pointer or the fourth parameter is negative.

** ^(2) The special constant, [SQLITE_STATIC], may be passsed to indicate that
** the application remains responsible for disposing of the object. ^In this
** case, the object and the provided pointer to it must remain valid until
** either the prepared statement is finalized or the same SQL parameter is
** bound to something else, whichever occurs sooner.
** ^(3) The constant, [SQLITE_TRANSIENT], may be passed to indicate that the

** object is to be copied prior to the return from sqlite3_bind_*(). ^The
** object and pointer to it must remain valid until then. ^SQLite will then
** manage the lifetime of its private copy.
**
** ^The sixth argument to sqlite3_bind_text64() must be one of
** [SQLITE_UTF8], [SQLITE_UTF16], [SQLITE_UTF16BE], or [SQLITE_UTF16LE]
** to specify the encoding of the text in the third parameter.  If
** the sixth argument to sqlite3_bind_text64() is not one of the
** allowed values shown above, or if the text encoding is different
** from the encoding specified by the sixth parameter, then the behavior

** SQLITE_SERIALIZE_NOCOPY bit is set but no contiguous copy
** of the database exists.
**
** A call to sqlite3_serialize(D,S,P,F) might return NULL even if the
** SQLITE_SERIALIZE_NOCOPY bit is omitted from argument F if a memory
** allocation error occurs.
**
** This interface is omitted if SQLite is compiled with the
** [SQLITE_OMIT_DESERIALIZE] option.
*/
SQLITE_API unsigned char *sqlite3_serialize(
  sqlite3 *db,           /* The database connection */
  const char *zSchema,   /* Which DB to serialize. ex: "main", "temp", ... */
  sqlite3_int64 *piSize, /* Write size of the DB here, if not NULL */
  unsigned int mFlags    /* Zero or more SQLITE_SERIALIZE_* flags */
);

** database is currently in a read transaction or is involved in a backup
** operation.
**
** If sqlite3_deserialize(D,S,P,N,M,F) fails for any reason and if the
** SQLITE_DESERIALIZE_FREEONCLOSE bit is set in argument F, then
** [sqlite3_free()] is invoked on argument P prior to returning.
**
** This interface is omitted if SQLite is compiled with the
** [SQLITE_OMIT_DESERIALIZE] option.
*/
SQLITE_API int sqlite3_deserialize(
  sqlite3 *db,            /* The database connection */
  const char *zSchema,    /* Which DB to reopen with the deserialization */
  unsigned char *pData,   /* The serialized database content */
  sqlite3_int64 szDb,     /* Number bytes in the deserialization */
  sqlite3_int64 szBuf,    /* Total size of buffer pData[] */

/*
** CAPIREF: Conigure a Session Object
** METHOD: sqlite3_session
**
** This method is used to configure a session object after it has been
** created. At present the only valid value for the second parameter is
** [SQLITE_SESSION_OBJCONFIG_SIZE].
**



** Arguments for sqlite3session_object_config()
**
** The following values may passed as the the 4th parameter to
** sqlite3session_object_config().
**
** <dt>SQLITE_SESSION_OBJCONFIG_SIZE <dd>
**   This option is used to set, clear or query the flag that enables
**   the [sqlite3session_changeset_size()] API. Because it imposes some
**   computational overhead, this API is disabled by default. Argument
**   pArg must point to a value of type (int). If the value is initially
**   0, then the sqlite3session_changeset_size() API is disabled. If it
**   is greater than 0, then the same API is enabled. Or, if the initial
**   value is less than zero, no change is made. In all cases the (int)
**   variable is set to 1 if the sqlite3session_changeset_size() API is
**   enabled following the current call, or 0 otherwise.
**
**   It is an error (SQLITE_MISUSE) to attempt to modify this setting after
**   the first table has been attached to the session object.
*/
SQLITE_API int sqlite3session_object_config(sqlite3_session*, int op, void *pArg);

/*
*/
#define SQLITE_SESSION_OBJCONFIG_SIZE 1

/*
** CAPI3REF: Enable Or Disable A Session Object
** METHOD: sqlite3_session
**

  sqlite3_session *pSession,      /* Session object */
  int *pnChangeset,               /* OUT: Size of buffer at *ppChangeset */
  void **ppChangeset              /* OUT: Buffer containing changeset */
);

/*
** CAPI3REF: Return An Upper-limit For The Size Of The Changeset
** METHOD: sqlite3_session
**
** By default, this function always returns 0. For it to return
** a useful result, the sqlite3_session object must have been configured
** to enable this API using sqlite3session_object_config() with the
** SQLITE_SESSION_OBJCONFIG_SIZE verb.
**
** When enabled, this function returns an upper limit, in bytes, for the size
** of the changeset that might be produced if sqlite3session_changeset() were
** called. The final changeset size might be equal to or smaller than the
** size in bytes returned by this function.
*/