SQLite

  ** for the pending-terms. If this is a scan, then this call must be being
  ** made by an fts4aux module, not an FTS table. In this case calling
  ** Fts3SegReaderPending might segfault, as the data structures used by 
  ** fts4aux are not completely populated. So it's easiest to filter these
  ** calls out here.  */
  if( iLevel<0 && p->aIndex ){
    Fts3SegReader *pSeg = 0;
    rc = sqlite3Fts3SegReaderPending(p, iIndex, zTerm, nTerm, isPrefix||isScan, &pSeg);
    if( rc==SQLITE_OK && pSeg ){
      rc = fts3SegReaderCursorAppend(pCsr, pSeg);
    }
  }

  if( iLevel!=FTS3_SEGCURSOR_PENDING ){
    if( rc==SQLITE_OK ){

/* 21 */  "SELECT size FROM %Q.'%q_docsize' WHERE docid=?",
/* 22 */  "SELECT value FROM %Q.'%q_stat' WHERE id=?",
/* 23 */  "REPLACE INTO %Q.'%q_stat' VALUES(?,?)",
/* 24 */  "",
/* 25 */  "",

/* 26 */ "DELETE FROM %Q.'%q_segdir' WHERE level BETWEEN ? AND ?",
/* 27 */ "SELECT ? UNION SELECT level / (1024 * ?) FROM %Q.'%q_segdir'",

/* This statement is used to determine which level to read the input from
** when performing an incremental merge. It returns the absolute level number
** of the oldest level in the db that contains at least ? segments. Or,
** if no level in the FTS index contains more than ? segments, the statement
** returns zero rows.  */
/* 28 */ "SELECT level FROM %Q.'%q_segdir' GROUP BY level HAVING count(*)>=?"

  int bSeenDone = 0;
  int rc;
  sqlite3_stmt *pAllLangid = 0;

  rc = fts3SqlStmt(p, SQL_SELECT_ALL_LANGID, &pAllLangid, 0);
  if( rc==SQLITE_OK ){
    int rc2;
    sqlite3_bind_int(pAllLangid, 1, p->iPrevLangid);
    sqlite3_bind_int(pAllLangid, 2, p->nIndex);
    while( sqlite3_step(pAllLangid)==SQLITE_ROW ){
      int i;
      int iLangid = sqlite3_column_int(pAllLangid, 0);
      for(i=0; rc==SQLITE_OK && i<p->nIndex; i++){
        rc = fts3SegmentMerge(p, iLangid, i, FTS3_SEGCURSOR_ALL);
        if( rc==SQLITE_DONE ){
          bSeenDone = 1;

  i = pHint->n-2;
  while( i>0 && (pHint->a[i-1] & 0x80) ) i--;
  while( i>0 && (pHint->a[i-1] & 0x80) ) i--;

  pHint->n = i;
  i += sqlite3Fts3GetVarint(&pHint->a[i], piAbsLevel);
  i += fts3GetVarint32(&pHint->a[i], pnInput);
  if( i!=nHint ) return FTS_CORRUPT_VTAB;

  return SQLITE_OK;
}


/*
** Attempt an incremental merge that writes nMerge leaf blocks.

  u64 cksum2 = 0;                 /* Checksum based on %_content contents */
  sqlite3_stmt *pAllLangid = 0;   /* Statement to return all language-ids */

  /* This block calculates the checksum according to the FTS index. */
  rc = fts3SqlStmt(p, SQL_SELECT_ALL_LANGID, &pAllLangid, 0);
  if( rc==SQLITE_OK ){
    int rc2;
    sqlite3_bind_int(pAllLangid, 1, p->iPrevLangid);
    sqlite3_bind_int(pAllLangid, 2, p->nIndex);
    while( rc==SQLITE_OK && sqlite3_step(pAllLangid)==SQLITE_ROW ){
      int iLangid = sqlite3_column_int(pAllLangid, 0);
      int i;
      for(i=0; i<p->nIndex; i++){
        cksum1 = cksum1 ^ fts3ChecksumIndex(p, iLangid, i, &rc);
      }
    }
    rc2 = sqlite3_reset(pAllLangid);
    if( rc==SQLITE_OK ) rc = rc2;
  }

  /* This block calculates the checksum according to the %_content table */

  if( rc==SQLITE_OK ){
    sqlite3_tokenizer_module const *pModule = p->pTokenizer->pModule;
    sqlite3_stmt *pStmt = 0;
    char *zSql;
   
    zSql = sqlite3_mprintf("SELECT %s" , p->zReadExprlist);
    if( !zSql ){

*/
static int fts3DoIntegrityCheck(
  Fts3Table *p                    /* FTS3 table handle */
){
  int rc;
  int bOk = 0;
  rc = fts3IntegrityCheck(p, &bOk);
  if( rc==SQLITE_OK && bOk==0 ) rc = FTS_CORRUPT_VTAB;
  return rc;
}

/*
** Handle a 'special' INSERT of the form:
**
**   "INSERT INTO tbl(tbl) VALUES(<expr>)"

  db close
  sqlite3 db test.db
  catchsql {
    INSERT INTO t4(t4) VALUES('integrity-check');
  }
} {1 {database disk image is malformed}}
reset_db

#--------------------------------------------------------------------------
# Test case 5.*
#
# Test that the integrity-check works if there is uncommitted data.
#
do_execsql_test 5.0 {
  BEGIN;
  CREATE VIRTUAL TABLE t5 USING fts4(a, prefix="1,2,3");
  INSERT INTO t5 VALUES('And down by Kosiosko, where the reed-banks sweep');
  INSERT INTO t5 VALUES('and sway, and the rolling plains are wide, the');
  INSERT INTO t5 VALUES('man from snowy river is a household name today,');
  INSERT INTO t5 VALUES('and the stockmen tell the story of his ride');
}

do_execsql_test 5.1 {
  INSERT INTO t5(t5) VALUES('integrity-check');
} {}

do_catchsql_test 5.2 {
  INSERT INTO t5_content VALUES(5, 'his hardy mountain pony');
  INSERT INTO t5(t5) VALUES('integrity-check');
} {1 {database disk image is malformed}}

do_execsql_test 5.3 ROLLBACK

do_execsql_test 5.4 {
  CREATE VIRTUAL TABLE t5 USING fts4(a, prefix="1,2,3");
  INSERT INTO t5(t5) VALUES('integrity-check');
} {}

finish_test

    "-- SELECT level, idx, end_block FROM 'main'.'x1_segdir' WHERE level BETWEEN ? AND ? ORDER BY level DESC, idx ASC"
  }

  do_trace_test 2.3 {
    INSERT INTO x1(x1) VALUES('optimize');
  } {
    "INSERT INTO x1(x1) VALUES('optimize');"
    "-- SELECT ? UNION SELECT level / (1024 * ?) FROM 'main'.'x1_segdir'"
    "-- SELECT idx, start_block, leaves_end_block, end_block, root FROM 'main'.'x1_segdir' WHERE level BETWEEN ? AND ?ORDER BY level DESC, idx ASC"
    "-- SELECT max(level) FROM 'main'.'x1_segdir' WHERE level BETWEEN ? AND ?"
    "-- SELECT coalesce((SELECT max(blockid) FROM 'main'.'x1_segments') + 1, 1)"
    "-- DELETE FROM 'main'.'x1_segdir' WHERE level BETWEEN ? AND ?"
    "-- REPLACE INTO 'main'.'x1_segdir' VALUES(?,?,?,?,?,?)"
  }
}