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Fix a problem causing the LEFT JOIN strength reduction optimization to be

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incorrectly applied in some cases where the WHERE clause of the query contains
a filter expression of the form "lhs.x IS NOT ?".

FossilOrigin-Name: 1fdaf2c34431adcac1c7ff29aae0623c4cbaa6a7f38e843c786bd407d8b3e730
This commit is contained in:
dan
2018-04-10 15:31:56 +00:00
parent 6831dbedeb
commit 0493222ff8
4 changed files with 16 additions and 8 deletions
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3
src/expr.c
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@@ -5018,6 +5018,7 @@ static int impliesNotNullRow(Walker *pWalker, Expr *pExpr){
if( ExprHasProperty(pExpr, EP_FromJoin) ) return WRC_Prune;
switch( pExpr->op ){
case TK_ISNOT:
case TK_NOT:
case TK_ISNULL:
case TK_IS:
@@ -5025,6 +5026,8 @@ static int impliesNotNullRow(Walker *pWalker, Expr *pExpr){
case TK_CASE:
case TK_IN:
case TK_FUNCTION:
testcase( pExpr->op==TK_ISNOT );
testcase( pExpr->op==TK_NOT );
testcase( pExpr->op==TK_ISNULL );
testcase( pExpr->op==TK_IS );
testcase( pExpr->op==TK_OR );