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Generalize the LEFT JOIN strength reduction optimization so that it works for

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RIGHT and FULL JOIN as well.  Rename it to the "OUTER JOIN strength reduction"
optimization.

FossilOrigin-Name: d747afda5683ca5feb92866a14ccc4c5127d3378ece5cad2c3da819f2477b457
This commit is contained in:
drh
2023-06-01 20:38:22 +00:00
parent 39a7a1a9be
commit 179c32cb57
7 changed files with 139 additions and 19 deletions
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2
src/expr.c
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@@ -6017,7 +6017,7 @@ static void bothImplyNotNullRow(Walker *pWalker, Expr *pE1, Expr *pE2){
static int impliesNotNullRow(Walker *pWalker, Expr *pExpr){
testcase( pExpr->op==TK_AGG_COLUMN );
testcase( pExpr->op==TK_AGG_FUNCTION );
if( ExprHasProperty(pExpr, EP_OuterON) ) return WRC_Prune;
if( ExprHasProperty(pExpr, EP_OuterON|EP_InnerON) ) return WRC_Prune;
switch( pExpr->op ){
case TK_ISNOT:
case TK_ISNULL: