Avoid creating a TOAST table for a partitioned table.

It's useless.

Amit Langote

Discussion: http://postgr.es/m/b4c9dee6-d134-49b8-79c4-07fbd7c3b898@lab.ntt.co.jp

src/backend/catalog/toasting.c

@@ -397,6 +397,7 @@ create_toast_table(Relation rel, Oid toastOid, Oid toastIndexOid,
  * (1) there are any toastable attributes, and (2) the maximum length
  * of a tuple could exceed TOAST_TUPLE_THRESHOLD.  (We don't want to
  * create a toast table for something like "f1 varchar(20)".)
+ * No need to create a TOAST table for partitioned tables.
  */
 static bool
 needs_toast_table(Relation rel)
@@ -408,6 +409,9 @@ needs_toast_table(Relation rel)
 	int32		tuple_length;
 	int			i;
 
+	if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
+		return false;
+
 	tupdesc = rel->rd_att;
 
 	for (i = 0; i < tupdesc->natts; i++)