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Overview
| Comment: | Add the SQLITE_ENABLE_EARLY_CURSOR_CLOSE compile-time option which causes read cursors to be closed after their usefulness ends during a two-pass UPDATE. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | branch-3.26 |
| Files: | files | file ages | folders |
| SHA3-256: | 8790368b4a96606f6c925db217a8e8ba |
| User & Date: | mistachkin 2019-01-22 18:20:22 |
Context
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2019-01-22
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| 18:20 | Add the SQLITE_ENABLE_EARLY_CURSOR_CLOSE compile-time option which causes read cursors to be closed after their usefulness ends during a two-pass UPDATE. Leaf check-in: 8790368b user: mistachkin tags: branch-3.26 | |
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2019-01-17
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| 19:33 | Add the SQLITE_ENABLE_EARLY_CURSOR_CLOSE compile-time option which causes read cursors to be closed after their usefulness ends during a two-pass UPDATE. check-in: 7def6c8e user: drh tags: trunk | |
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2018-12-12
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| 11:57 | OSSFuzz found a case where an assert() inside sqlite3ExprCompare() can be true. Test case added to TH3. check-in: bc891ac6 user: drh tags: branch-3.26 | |
Changes
Changes to src/where.c.
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*/
if( pTabItem->fg.viaCoroutine ){
testcase( pParse->db->mallocFailed );
translateColumnToCopy(pParse, pLevel->addrBody, pLevel->iTabCur,
pTabItem->regResult, 0);
continue;
}
/* If this scan uses an index, make VDBE code substitutions to read data
** from the index instead of from the table where possible. In some cases
** this optimization prevents the table from ever being read, which can
** yield a significant performance boost.
**
** Calls to the code generator in between sqlite3WhereBegin and
|
> > > > > > > > > > > > > > > > > > > > > > > |
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*/
if( pTabItem->fg.viaCoroutine ){
testcase( pParse->db->mallocFailed );
translateColumnToCopy(pParse, pLevel->addrBody, pLevel->iTabCur,
pTabItem->regResult, 0);
continue;
}
#ifdef SQLITE_ENABLE_EARLY_CURSOR_CLOSE
/* Close all of the cursors that were opened by sqlite3WhereBegin.
** Except, do not close cursors that will be reused by the OR optimization
** (WHERE_OR_SUBCLAUSE). And do not close the OP_OpenWrite cursors
** created for the ONEPASS optimization.
*/
if( (pTab->tabFlags & TF_Ephemeral)==0
&& pTab->pSelect==0
&& (pWInfo->wctrlFlags & WHERE_OR_SUBCLAUSE)==0
){
int ws = pLoop->wsFlags;
if( pWInfo->eOnePass==ONEPASS_OFF && (ws & WHERE_IDX_ONLY)==0 ){
sqlite3VdbeAddOp1(v, OP_Close, pTabItem->iCursor);
}
if( (ws & WHERE_INDEXED)!=0
&& (ws & (WHERE_IPK|WHERE_AUTO_INDEX))==0
&& pLevel->iIdxCur!=pWInfo->aiCurOnePass[1]
){
sqlite3VdbeAddOp1(v, OP_Close, pLevel->iIdxCur);
}
}
#endif
/* If this scan uses an index, make VDBE code substitutions to read data
** from the index instead of from the table where possible. In some cases
** this optimization prevents the table from ever being read, which can
** yield a significant performance boost.
**
** Calls to the code generator in between sqlite3WhereBegin and
|