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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 |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
7def6c8edd85f19ee09038e01541f75b |
| User & Date: | drh 2019-01-17 19:33:16.502 |
Context
|
2019-01-22
| ||
| 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. (check-in: 8790368b4a user: mistachkin tags: branch-3.26) | |
|
2019-01-17
| ||
| 20:06 | Fix another corruption related crash in fts5. (check-in: 4538d9afe4 user: dan tags: trunk) | |
| 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: 7def6c8edd user: drh tags: trunk) | |
| 19:11 | Fix a buffer overwrite that could occur when running an fts5 prefix query against a corrupt database. (check-in: 3910b5639d user: dan tags: trunk) | |
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
| > > > > > > > > > > > > > > > > > > > > > > > | 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 |
*/
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
|
| ︙ | ︙ |