From dd077ef832e1ec7f5ba2a706152d22647a3b80f5 Mon Sep 17 00:00:00 2001
From: Robert Haas <rhaas@postgresql.org>
Date: Sun, 21 Feb 2016 14:17:50 +0530
Subject: [PATCH] postgres_fdw: Avoid sharing list substructure.
list_concat(list_concat(a, b), c) destructively changes both a and b;
to avoid such perils, copy lists of remote_conds before incorporating
them into larger lists via list_concat().
Ashutosh Bapat, per a report from Etsuro Fujita
---
contrib/postgres_fdw/postgres_fdw.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/contrib/postgres_fdw/postgres_fdw.c b/contrib/postgres_fdw/postgres_fdw.c
index 465f43cd7c9..d79e4ccbe3d 100644
--- a/contrib/postgres_fdw/postgres_fdw.c
+++ b/contrib/postgres_fdw/postgres_fdw.c
@@ -3488,30 +3488,30 @@ foreign_join_ok(PlannerInfo *root, RelOptInfo *joinrel, JoinType jointype,
{
case JOIN_INNER:
fpinfo->remote_conds = list_concat(fpinfo->remote_conds,
- fpinfo_i->remote_conds);
+ list_copy(fpinfo_i->remote_conds));
fpinfo->remote_conds = list_concat(fpinfo->remote_conds,
- fpinfo_o->remote_conds);
+ list_copy(fpinfo_o->remote_conds));
break;
case JOIN_LEFT:
fpinfo->joinclauses = list_concat(fpinfo->joinclauses,
- fpinfo_i->remote_conds);
+ list_copy(fpinfo_i->remote_conds));
fpinfo->remote_conds = list_concat(fpinfo->remote_conds,
- fpinfo_o->remote_conds);
+ list_copy(fpinfo_o->remote_conds));
break;
case JOIN_RIGHT:
fpinfo->joinclauses = list_concat(fpinfo->joinclauses,
- fpinfo_o->remote_conds);
+ list_copy(fpinfo_o->remote_conds));
fpinfo->remote_conds = list_concat(fpinfo->remote_conds,
- fpinfo_i->remote_conds);
+ list_copy(fpinfo_i->remote_conds));
break;
case JOIN_FULL:
fpinfo->joinclauses = list_concat(fpinfo->joinclauses,
- fpinfo_i->remote_conds);
+ list_copy(fpinfo_i->remote_conds));
fpinfo->joinclauses = list_concat(fpinfo->joinclauses,
- fpinfo_o->remote_conds);
+ list_copy(fpinfo_o->remote_conds));
break;
default:
--
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