From b8a91d9d1c7ec75aaecf13df687ec7b5b0ed35a6 Mon Sep 17 00:00:00 2001
From: Simon Riggs <simon@2ndQuadrant.com>
Date: Mon, 23 Jan 2012 23:25:04 +0000
Subject: ALTER <thing> [IF EXISTS] ... allows silent DDL if required, e.g.
 ALTER FOREIGN TABLE IF EXISTS foo RENAME TO bar

Pavel Stehule
---
 src/backend/parser/parse_utilcmd.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'src/backend/parser/parse_utilcmd.c')

diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index 99157c53493..f1a108a9828 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -2283,7 +2283,15 @@ transformAlterTableStmt(AlterTableStmt *stmt, const char *queryString)
 	 * new commands we add after this must not upgrade the lock level
 	 * requested here.
 	 */
-	rel = relation_openrv(stmt->relation, lockmode);
+	rel = relation_openrv_extended(stmt->relation, lockmode, stmt->missing_ok);
+	if (rel == NULL)
+	{
+		/* this message is consistent with relation_openrv */
+		ereport(NOTICE,
+				(errmsg("relation \"%s\" does not exist, skipping",
+							stmt->relation->relname)));
+		return NIL;
+	}
 
 	/* Set up pstate and CreateStmtContext */
 	pstate = make_parsestate(NULL);
-- 
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