Make partitions automatically inherit OIDs.

Previously, if the parent was specified as WITH OIDS, each child
also had to be explicitly specified as WITH OIDS.

Amit Langote, per a report from Simon Riggs.  Some additional
work on the documentation changes by me.

Discussion: http://postgr.es/m/CANP8+jJBpWocfKrbJcaf3iBt9E3U=WPE_NC8YE6rye+YJ1sYnQ@mail.gmail.com

3 files changed, 27 insertions, 22 deletions

diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index f33aa70da6..3cea220421 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -634,19 +634,14 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 									  relkind == RELKIND_PARTITIONED_TABLE));
 	descriptor->tdhasoid = (localHasOids || parentOidCount > 0);
 
-	if (stmt->partbound)
-	{
-		/* If the parent has OIDs, partitions must have them too. */
-		if (parentOidCount > 0 && !localHasOids)
-			ereport(ERROR,
-					(errcode(ERRCODE_WRONG_OBJECT_TYPE),
-					 errmsg("cannot create table without OIDs as partition of table with OIDs")));
-		/* If the parent doesn't, partitions must not have them. */
-		if (parentOidCount == 0 && localHasOids)
-			ereport(ERROR,
-					(errcode(ERRCODE_WRONG_OBJECT_TYPE),
-					 errmsg("cannot create table with OIDs as partition of table without OIDs")));
-	}
+	/*
+	 * If a partitioned table doesn't have the system OID column, then none
+	 * of its partitions should have it.
+	 */
+	if (stmt->partbound && parentOidCount == 0 && localHasOids)
+		ereport(ERROR,
+				(errcode(ERRCODE_WRONG_OBJECT_TYPE),
+				 errmsg("cannot create table with OIDs as partition of table without OIDs")));
 
 	/*
 	 * Find columns with default values and prepare for insertion of the
diff --git a/src/test/regress/expected/create_table.out b/src/test/regress/expected/create_table.out
index fc92cd92dd..20eb3d35f9 100644
--- a/src/test/regress/expected/create_table.out
+++ b/src/test/regress/expected/create_table.out
@@ -524,16 +524,24 @@ DROP TABLE temp_parted;
 CREATE TABLE no_oids_parted (
 	a int
 ) PARTITION BY RANGE (a) WITHOUT OIDS;
-CREATE TABLE fail_part PARTITION OF no_oids_parted FOR VALUES FROM (1) TO (10 )WITH OIDS;
+CREATE TABLE fail_part PARTITION OF no_oids_parted FOR VALUES FROM (1) TO (10) WITH OIDS;
 ERROR:  cannot create table with OIDs as partition of table without OIDs
 DROP TABLE no_oids_parted;
--- likewise, the reverse if also true
+-- If the partitioned table has oids, then the partition must have them.
+-- If the WITHOUT OIDS option is specified for partition, it is overridden.
 CREATE TABLE oids_parted (
 	a int
 ) PARTITION BY RANGE (a) WITH OIDS;
-CREATE TABLE fail_part PARTITION OF oids_parted FOR VALUES FROM (1) TO (10 ) WITHOUT OIDS;
-ERROR:  cannot create table without OIDs as partition of table with OIDs
-DROP TABLE oids_parted;
+CREATE TABLE part_forced_oids PARTITION OF oids_parted FOR VALUES FROM (1) TO (10) WITHOUT OIDS;
+\d+ part_forced_oids
+                             Table "public.part_forced_oids"
+ Column |  Type   | Collation | Nullable | Default | Storage | Stats target | Description 
+--------+---------+-----------+----------+---------+---------+--------------+-------------
+ a      | integer |           | not null |         | plain   |              | 
+Partition of: oids_parted FOR VALUES FROM (1) TO (10)
+Has OIDs: yes
+
+DROP TABLE oids_parted, part_forced_oids;
 -- check for partition bound overlap and other invalid specifications
 CREATE TABLE list_parted2 (
 	a varchar
diff --git a/src/test/regress/sql/create_table.sql b/src/test/regress/sql/create_table.sql
index 5f25c436ee..f41dd71475 100644
--- a/src/test/regress/sql/create_table.sql
+++ b/src/test/regress/sql/create_table.sql
@@ -493,15 +493,17 @@ DROP TABLE temp_parted;
 CREATE TABLE no_oids_parted (
 	a int
 ) PARTITION BY RANGE (a) WITHOUT OIDS;
-CREATE TABLE fail_part PARTITION OF no_oids_parted FOR VALUES FROM (1) TO (10 )WITH OIDS;
+CREATE TABLE fail_part PARTITION OF no_oids_parted FOR VALUES FROM (1) TO (10) WITH OIDS;
 DROP TABLE no_oids_parted;
 
--- likewise, the reverse if also true
+-- If the partitioned table has oids, then the partition must have them.
+-- If the WITHOUT OIDS option is specified for partition, it is overridden.
 CREATE TABLE oids_parted (
 	a int
 ) PARTITION BY RANGE (a) WITH OIDS;
-CREATE TABLE fail_part PARTITION OF oids_parted FOR VALUES FROM (1) TO (10 ) WITHOUT OIDS;
-DROP TABLE oids_parted;
+CREATE TABLE part_forced_oids PARTITION OF oids_parted FOR VALUES FROM (1) TO (10) WITHOUT OIDS;
+\d+ part_forced_oids
+DROP TABLE oids_parted, part_forced_oids;
 
 -- check for partition bound overlap and other invalid specifications