From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Mon, 21 Apr 2003 15:20:02 +0000 (+0000)
Subject: Prevent palloc(0) error when parent table has zero columns.
X-Git-Url: http://git.postgresql.org/gitweb/static/gitweb.js?a=commitdiff_plain;h=c79c06ea347468a17df7d3261b9a7501faa15fa4;p=users%2Fbernd%2Fpostgres.git

Prevent palloc(0) error when parent table has zero columns.
---

diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 9b27780bc5..02747661a1 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -576,9 +576,10 @@ MergeAttributes(List *schema, List *supers, bool istemp,
 		 * newattno[] will contain the child-table attribute numbers for
 		 * the attributes of this parent table.  (They are not the same
 		 * for parents after the first one, nor if we have dropped
-		 * columns.)
+		 * columns.)  +1 is to prevent error if parent has zero columns.
 		 */
-		newattno = (AttrNumber *) palloc(tupleDesc->natts * sizeof(AttrNumber));
+		newattno = (AttrNumber *)
+			palloc((tupleDesc->natts + 1) * sizeof(AttrNumber));
 
 		for (parent_attno = 1; parent_attno <= tupleDesc->natts;
 			 parent_attno++)