-- Licensed to the Apache Software Foundation (ASF) under one or more
-- contributor license agreements.  See the NOTICE file distributed with
-- this work for additional information regarding copyright ownership.
-- The ASF licenses this file to You under the Apache License, Version 2.0
-- (the "License") you may not use this file except in compliance with
-- the License.  You may obtain a copy of the License at
--
--     http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.

explain
SELECT *
FROM (
  SELECT 1 AS id
  FROM (SELECT * FROM src LIMIT 1) s1
  CLUSTER BY id
  UNION ALL
  SELECT 2 AS id
  FROM (SELECT * FROM src LIMIT 1) s1
  CLUSTER BY id
  UNION ALL
  SELECT 3 AS id
  FROM (SELECT * FROM src LIMIT 1) s2
  UNION ALL
  SELECT 4 AS id
  FROM (SELECT * FROM src LIMIT 1) s2
) a;



CREATE TABLE union_out (id int);

insert overwrite table union_out 
SELECT *
FROM (
  SELECT 1 AS id
  FROM (SELECT * FROM src LIMIT 1) s1
  CLUSTER BY id
  UNION ALL
  SELECT 2 AS id
  FROM (SELECT * FROM src LIMIT 1) s1
  CLUSTER BY id
  UNION ALL
  SELECT 3 AS id
  FROM (SELECT * FROM src LIMIT 1) s2
  UNION ALL
  SELECT 4 AS id
  FROM (SELECT * FROM src LIMIT 1) s2
) a;

select * from union_out cluster by id;
