From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Sat, 18 Sep 1999 23:30:05 +0000 (+0000)
Subject: Back-patch fix for NULL condition in CASE.
X-Git-Tag: REL6_5_3~30
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7fe22f5c8b09086c85fba906518c64315970665e;p=thirdparty%2Fpostgresql.git

Back-patch fix for NULL condition in CASE.
---

diff --git a/src/backend/executor/execQual.c b/src/backend/executor/execQual.c
index 58acc885ba2..5e2cc88c52b 100644
--- a/src/backend/executor/execQual.c
+++ b/src/backend/executor/execQual.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.53 1999/06/12 19:22:40 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.53.2.1 1999/09/18 23:30:05 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1128,9 +1128,10 @@ ExecEvalCase(CaseExpr *caseExpr, ExprContext *econtext, bool *isNull)
 
 		/*
 		 * if we have a true test, then we return the result, since the
-		 * case statement is satisfied.
+		 * case statement is satisfied.  A NULL result from the test is
+		 * not considered true.
 		 */
-		if (DatumGetInt32(const_value) != 0)
+		if (DatumGetInt32(const_value) != 0 && ! *isNull)
 		{
 			const_value = ExecEvalExpr((Node *) wclause->result,
 									   econtext,