From: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: Mon, 28 Nov 2005 13:35:09 +0000 (+0000)
Subject: Set a snapshot before running analyze on a single table, to avoid a
X-Git-Tag: REL9_0_0~8837
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=d4fc4ac4c7a96434e5baa8702ead10f7dc693014;p=pg-rex%2Fsyncrep.git

Set a snapshot before running analyze on a single table, to avoid a
crash when analyzing tables with expressional indexes.

Per report from Frank van Vugt.
---

diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index c3376256f1..4140df6553 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -10,7 +10,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/postmaster/autovacuum.c,v 1.6 2005/11/22 18:17:17 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/postmaster/autovacuum.c,v 1.7 2005/11/28 13:35:09 alvherre Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -898,6 +898,14 @@ autovacuum_do_vac_analyze(List *relids, bool dovacuum, bool doanalyze,
 	vacstmt->relation = NULL;	/* all tables, or not used if relids != NIL */
 	vacstmt->va_cols = NIL;
 
+	/*
+	 * Functions in indexes may want a snapshot set.  Note we only need
+	 * to do this in limited cases, because it'll be done in vacuum()
+	 * otherwise.
+	 */
+	if (doanalyze && !dovacuum && relids != NIL)
+		ActiveSnapshot = CopySnapshot(GetTransactionSnapshot());
+
 	vacuum(vacstmt, relids);
 
 	pfree(vacstmt);