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Update the omit-left-join optimization so that it works in some cases when the

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RHS is subject to a UNIQUE but not NOT NULL constraint.

FossilOrigin-Name: 88411a402b29f19d69e0d06d9099eabb98c238ddb7c07ce110236316f008753e
This commit is contained in:
dan
2018-01-29 17:08:52 +00:00
parent 26e731cc88
commit 8433e7166b
4 changed files with 82 additions and 13 deletions
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10
src/where.c
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@@ -2481,10 +2481,13 @@ static int whereLoopAddBtreeIndex(
if( iCol==XN_ROWID
|| (iCol>=0 && nInMul==0 && saved_nEq==pProbe->nKeyCol-1)
){
if( iCol>=0 && pProbe->uniqNotNull==0 ){
pNew->wsFlags |= WHERE_UNQ_WANTED;
}else{
assert( iCol!=XN_ROWID || pProbe->uniqNotNull );
if( pProbe->uniqNotNull
|| (pProbe->nKeyCol==1 && pProbe->onError && eOp==WO_EQ)
){
pNew->wsFlags |= WHERE_ONEROW;
}else{
pNew->wsFlags |= WHERE_UNQ_WANTED;
}
}
}else if( eOp & WO_ISNULL ){
@@ -2825,6 +2828,7 @@ static int whereLoopAddBtree(
sPk.onError = OE_Replace;
sPk.pTable = pTab;
sPk.szIdxRow = pTab->szTabRow;
sPk.uniqNotNull = 1;
aiRowEstPk[0] = pTab->nRowLogEst;
aiRowEstPk[1] = 0;
pFirst = pSrc->pTab->pIndex;