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Code review for IS DISTINCT FROM patch. Fix incorrect constant-folding

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logic, dissuade planner from thinking that 'x IS DISTINCT FROM 42' may
be optimized into 'x = 42' (!!), cause dependency on = operator to be
recorded correctly, minor other improvements.
This commit is contained in:
Tom Lane
2002-11-30 21:25:08 +00:00
parent 36c356e799
commit 2b7ec402c4
7 changed files with 70 additions and 115 deletions
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12
src/backend/optimizer/plan/setrefs.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/setrefs.c,v 1.82 2002/11/19 23:21:59 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/setrefs.c,v 1.83 2002/11/30 21:25:04 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -575,7 +575,13 @@ fix_opids_walker(Node *node, void *context)
{
if (node == NULL)
return false;
if (is_opclause(node))
replace_opid((Oper *) ((Expr *) node)->oper);
if (IsA(node, Expr))
{
Expr *expr = (Expr *) node;
if (expr->opType == OP_EXPR ||
expr->opType == DISTINCT_EXPR)
replace_opid((Oper *) expr->oper);
}
return expression_tree_walker(node, fix_opids_walker, context);
}