disallow creating distributed tables when the table has WITH (OIDS) set, as per @jasonmp85.

src/backend/distributed/commands/create_distributed_table.c

@@ -50,6 +50,7 @@ static void RecordDistributedRelationDependencies(Oid distributedRelationId,
 static Oid SupportFunctionForColumn(Var *partitionColumn, Oid accessMethodId,
 									int16 supportFunctionNumber);
 static bool LocalTableEmpty(Oid tableId);
+static void ErrorIfTableHasOids(Relation relation);
 
 
 /* exports for SQL callable functions */
@@ -101,6 +102,7 @@ master_create_distributed_table(PG_FUNCTION_ARGS)
 	distributedRelationName = RelationGetRelationName(distributedRelation);
 
 	EnsureTableOwner(distributedRelationId);
+	ErrorIfTableHasOids(distributedRelation);
 
 	/* open system catalog and insert new tuple */
 	pgDistPartition = heap_open(DistPartitionRelationId(), RowExclusiveLock);
@@ -446,3 +448,18 @@ LocalTableEmpty(Oid tableId)
 
 	return localTableEmpty;
 }
+
+
+/*
+ *  ErrorIfTableHasOids raises an ERROR if a to-be-distributed table
+ *  has the WITH (OIDS) option set.
+ */
+static void
+ErrorIfTableHasOids(Relation relation)
+{
+	if (relation->rd_att->tdhasoid)
+	{
+		ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+						errmsg("WITH (OIDS) not supported on distributed tables")));
+	}
+}

src/test/regress/expected/multi_create_shards.out

@@ -40,6 +40,12 @@ CREATE TABLE table_to_distribute (
 	json_data json,
 	test_type_data dummy_type
 );
+-- use the table WITH (OIDS) set
+ALTER TABLE table_to_distribute SET WITH OIDS;
+SELECT master_create_distributed_table('table_to_distribute', 'id', 'hash');
+ERROR:  WITH (OIDS) not supported on distributed tables
+-- revert WITH (OIDS) from above
+ALTER TABLE table_to_distribute SET WITHOUT OIDS;
 -- use an index instead of table name
 SELECT master_create_distributed_table('table_to_distribute_pkey', 'id', 'hash');
 ERROR:  cannot distribute relation: table_to_distribute_pkey

src/test/regress/sql/multi_create_shards.sql

@@ -52,6 +52,13 @@ CREATE TABLE table_to_distribute (
 	test_type_data dummy_type
 );
 
+-- use the table WITH (OIDS) set
+ALTER TABLE table_to_distribute SET WITH OIDS;
+SELECT master_create_distributed_table('table_to_distribute', 'id', 'hash');
+
+-- revert WITH (OIDS) from above
+ALTER TABLE table_to_distribute SET WITHOUT OIDS;
+
 -- use an index instead of table name
 SELECT master_create_distributed_table('table_to_distribute_pkey', 'id', 'hash');