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COALESCE() and NULLIF() are now first-class expressions, not macros

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that turn into CASE expressions.  They evaluate their arguments at most
once.  Patch by Kris Jurka, review and (very light) editorializing by me.
This commit is contained in:
Tom Lane
2003-02-16 02:30:39 +00:00
parent de25638d2f
commit 51972a9d5d
22 changed files with 644 additions and 107 deletions
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5
src/backend/optimizer/path/costsize.c
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@@ -49,7 +49,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/costsize.c,v 1.106 2003/02/15 21:39:58 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/costsize.c,v 1.107 2003/02/16 02:30:38 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1468,7 +1468,8 @@ cost_qual_eval_walker(Node *node, QualCost *total)
*/
if (IsA(node, FuncExpr) ||
IsA(node, OpExpr) ||
IsA(node, DistinctExpr))
IsA(node, DistinctExpr) ||
IsA(node, NullIfExpr))
{
total->per_tuple += cpu_operator_cost;
}