From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Sun, 1 Oct 2006 17:23:51 +0000 (+0000)
Subject: Fix overly enthusiastic Assert introduced in 8.1: it's expecting a
X-Git-Url: http://git.postgresql.org/gitweb/static/gitweb.js?a=commitdiff_plain;h=a0b527c6e74c4f3719c1b1f64ce9c61965b90d46;p=users%2Fbernd%2Fpostgres.git

Fix overly enthusiastic Assert introduced in 8.1: it's expecting a
CaseTestExpr, but forgot that the optimizer is sometimes able to replace
CaseTestExpr by Const.
---

diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index c08ff098e5..613d798245 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -3458,14 +3458,18 @@ get_rule_expr(Node *node, deparse_context *context,
 						 * the optimizer's simplify_boolean_equality() may
 						 * have reduced this to just "CaseTestExpr" or
 						 * "NOT CaseTestExpr", for which we have to show
-						 * "TRUE" or "FALSE".
+						 * "TRUE" or "FALSE".  Also, depending on context
+						 * the original CaseTestExpr might have been reduced
+						 * to a Const (but we won't see "WHEN Const").
 						 */
 						if (IsA(w, OpExpr))
 						{
 							Node	   *rhs;
 
 							Assert(IsA(linitial(((OpExpr *) w)->args),
-									   CaseTestExpr));
+									   CaseTestExpr) ||
+								   IsA(linitial(((OpExpr *) w)->args),
+									   Const));
 							rhs = (Node *) lsecond(((OpExpr *) w)->args);
 							get_rule_expr(rhs, context, false);
 						}