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Attempt to optimize "x IS NULL" and "x IS NOT NULL" expressions when x is a column with a NOT NULL constraint.

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FossilOrigin-Name: 5ecd842555009ce27ee6390325ac5c2504143474b12b730933f0833b3dad788a
This commit is contained in:
dan
2021-02-26 20:14:32 +00:00
parent 4b17455ab2
commit 8ddf686267
6 changed files with 150 additions and 9 deletions
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3
src/select.c
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@@ -407,6 +407,9 @@ static void unsetJoinExpr(Expr *p, int iTable){
&& (iTable<0 || p->iRightJoinTable==iTable) ){
ExprClearProperty(p, EP_FromJoin);
}
if( p->op==TK_COLUMN && p->iTable==iTable ){
ExprClearProperty(p, EP_CanBeNull);
}
if( p->op==TK_FUNCTION && p->x.pList ){
int i;
for(i=0; i<p->x.pList->nExpr; i++){