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If all branches of an OR optimize scan that is the rhs of a LEFT JOIN use the

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same index, set the index cursor to return NULL values if there are no matches
for a row on the lhs.

FossilOrigin-Name: e7b9bc678ecb75c594d9d3ade12a99a8d551cdc9
This commit is contained in:
dan
2016-10-26 15:46:09 +00:00
parent d240f091c6
commit b40897ab5e
4 changed files with 95 additions and 14 deletions
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10
src/where.c
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@@ -4860,13 +4860,15 @@ void sqlite3WhereEnd(WhereInfo *pWInfo){
}
#endif
if( pLevel->iLeftJoin ){
int ws = pLoop->wsFlags;
addr = sqlite3VdbeAddOp1(v, OP_IfPos, pLevel->iLeftJoin); VdbeCoverage(v);
assert( (pLoop->wsFlags & WHERE_IDX_ONLY)==0
|| (pLoop->wsFlags & WHERE_INDEXED)!=0 );
if( (pLoop->wsFlags & WHERE_IDX_ONLY)==0 ){
assert( (ws & WHERE_IDX_ONLY)==0 || (ws & WHERE_INDEXED)!=0 );
if( (ws & WHERE_IDX_ONLY)==0 ){
sqlite3VdbeAddOp1(v, OP_NullRow, pTabList->a[i].iCursor);
}
if( pLoop->wsFlags & WHERE_INDEXED ){
if( (ws & WHERE_INDEXED)
|| ((ws & WHERE_MULTI_OR) && pLevel->u.pCovidx)
){
sqlite3VdbeAddOp1(v, OP_NullRow, pLevel->iIdxCur);
}
if( pLevel->op==OP_Return ){