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Fix a problem preventing the planner from identifying scans that visit at most

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one row in cases where that property is guaranteed by a unique, not-null,
non-IPK column that is the leftmost in its table.

FossilOrigin-Name: 299d7ca52fec32f04ffd2b8561dd4b839e891792162f8b00259368683436b02d
This commit is contained in:
dan
2017-11-20 14:40:03 +00:00
parent de7c4ec72c
commit 75dbf68b5b
4 changed files with 40 additions and 10 deletions
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2
src/where.c
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@@ -2460,7 +2460,7 @@ static int whereLoopAddBtreeIndex(
pNew->wsFlags |= WHERE_COLUMN_EQ;
assert( saved_nEq==pNew->u.btree.nEq );
if( iCol==XN_ROWID
|| (iCol>0 && nInMul==0 && saved_nEq==pProbe->nKeyCol-1)
|| (iCol>=0 && nInMul==0 && saved_nEq==pProbe->nKeyCol-1)
){
if( iCol>=0 && pProbe->uniqNotNull==0 ){
pNew->wsFlags |= WHERE_UNQ_WANTED;