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Add the SQLITE_ENABLE_EARLY_CURSOR_CLOSE compile-time option which causes

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read cursors to be closed after their usefulness ends during a two-pass
UPDATE.

FossilOrigin-Name: 7def6c8edd85f19ee09038e01541f75b1f71ca39b9fb782b8f0fcac89207c353
This commit is contained in:
drh 2019-01-17 19:33:16 +00:00
parent f66da6ce8e
commit aa0f2d0efa
3 changed files with 31 additions and 8 deletions
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14
manifest
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@ -1,5 +1,5 @@
C Fix\sa\sbuffer\soverwrite\sthat\scould\soccur\swhen\srunning\san\sfts5\sprefix\squery\nagainst\sa\scorrupt\sdatabase.
D 2019-01-17T19:11:10.179
C Add\sthe\sSQLITE_ENABLE_EARLY_CURSOR_CLOSE\scompile-time\soption\swhich\scauses\nread\scursors\sto\sbe\sclosed\safter\stheir\susefulness\sends\sduring\sa\stwo-pass\nUPDATE.
D 2019-01-17T19:33:16.502
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F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F Makefile.in 2a9d0331ab57c68173a4c2fe9046fe89c4d916a888e04dd7a2d36958c2bff777
@ -598,7 +598,7 @@ F src/vxworks.h d2988f4e5a61a4dfe82c6524dd3d6e4f2ce3cdb9
F src/wal.c 3f4f653daf234fe713edbcbca3fec2350417d159d28801feabc702a22c4e213f
F src/wal.h 606292549f5a7be50b6227bd685fa76e3a4affad71bb8ac5ce4cb5c79f6a176a
F src/walker.c fb94aadc9099ff9c6506d0a8b88d51266005bcaa265403f3d7caf732a562eb66
F src/where.c dc293ea4230adf9a323fb2e5750eff565347567a3cd6538f7d0fa93b11c2baae
F src/where.c c5d201699d03be61c35bc04b96e481b1c8dc68177617ca1db156ef7409da2fae
F src/whereInt.h 5f14db426ca46a83eabab1ae9aa6d4b8f27504ad35b64c290916289b1ddb2e88
F src/wherecode.c 89d2ec668aec884dfa7ac500c6744e42ec0590fcd72fb740a8b48326a8412811
F src/whereexpr.c 36b47f7261d6b6f1a72d774c113b74beddf6745aba1018e64b196e29db233442
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@ -1 +1 @@
3910b5639d5c96d1840d4feeea64d3a55073531b7365a4e75d9cda6f119f3cfc
7def6c8edd85f19ee09038e01541f75b1f71ca39b9fb782b8f0fcac89207c353

23
src/where.c
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@ -5262,6 +5262,29 @@ void sqlite3WhereEnd(WhereInfo *pWInfo){
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