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Use an OP_NotFound opcode to cancel futile IN operators early. The current

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implementation is suboptimal because it always runs teh OP_NotFound.  This
still needs to be enhanced to only do the OP_NotFound if no results have been
seen on the current loop.

FossilOrigin-Name: 87a9fc504f9a78caf7a7949cc7ada0a19d61bfab51bb49a00a1607194c116212
This commit is contained in:
drh
2018-06-05 15:16:25 +00:00
parent 995bbbf993
commit 86d0ea7558
4 changed files with 17 additions and 11 deletions
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4
src/where.c
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@@ -5084,8 +5084,10 @@ void sqlite3WhereEnd(WhereInfo *pWInfo){
sqlite3VdbeJumpHere(v, pIn->addrInTop+1);
if( pIn->eEndLoopOp!=OP_Noop ){
if( pIn->nPrefix ){
sqlite3VdbeAddOp3(v, OP_Noop, pLevel->iIdxCur,
sqlite3VdbeAddOp4Int(v, OP_NotFound, pLevel->iIdxCur,
sqlite3VdbeCurrentAddr(v)+2,
pIn->iBase, pIn->nPrefix);
VdbeCoverage(v);
}
sqlite3VdbeAddOp2(v, pIn->eEndLoopOp, pIn->iCur, pIn->addrInTop);
VdbeCoverage(v);