From: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: Mon, 28 Nov 2005 13:34:10 +0000 (+0000)
Subject: Set a snapshot before running analyze on a single table, to avoid a
X-Git-Url: http://waps.l3s.uni-hannover.de/gitweb/?a=commitdiff_plain;h=d748fa633508df7318c29dfbecd8a52ff823a160;p=users%2Fbernd%2Fpostgres.git

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

diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index cd4f274946..7969d8e98e 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -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);