database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-11-14 00:22:38 +03:00
Code Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

8
src/wherecode.c
View File

@@ -592,8 +592,12 @@ static int codeEqualityTerm(
if( i==iEq ){
pIn->iCur = iTab;
pIn->eEndLoopOp = bRev ? OP_PrevIfOpen : OP_NextIfOpen;
pIn->iBase = iReg - i;
pIn->nPrefix = i;
if( (pLoop->wsFlags & WHERE_VIRTUALTABLE)==0 ){
pIn->iBase = iReg - i;
pIn->nPrefix = i;
}else{
pIn->nPrefix = 0;
}
}else{
pIn->eEndLoopOp = OP_Noop;
}