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Add the OP_IfNoHope and OP_SeekHit opcodes used to reduce the number of

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unnecessary sqlite3BtreeMovetoUnpacked() calls when checking for an early
exit on IN-operator loops.  Futher optimizations are likely possible here.

FossilOrigin-Name: 6bf251af4347165a470d39457d61ab6d2a06c206db8f30bd8be5dbb388ae8a5b
This commit is contained in:
drh
2018-06-05 20:45:20 +00:00
parent 86d0ea7558
commit 8c2b6d784b
6 changed files with 74 additions and 12 deletions
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2
src/where.c
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@@ -5084,7 +5084,7 @@ void sqlite3WhereEnd(WhereInfo *pWInfo){
sqlite3VdbeJumpHere(v, pIn->addrInTop+1);
if( pIn->eEndLoopOp!=OP_Noop ){
if( pIn->nPrefix ){
sqlite3VdbeAddOp4Int(v, OP_NotFound, pLevel->iIdxCur,
sqlite3VdbeAddOp4Int(v, OP_IfNoHope, pLevel->iIdxCur,
sqlite3VdbeCurrentAddr(v)+2,
pIn->iBase, pIn->nPrefix);
VdbeCoverage(v);