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Posted to dev@hive.apache.org by "Pengcheng Xiong (JIRA)" <ji...@apache.org> on 2014/12/02 01:02:13 UTC

[jira] [Created] (HIVE-9002) union all does not generate correct result for order by and limit

Pengcheng Xiong created HIVE-9002:
-------------------------------------

             Summary: union all does not generate correct result for order by and limit
                 Key: HIVE-9002
                 URL: https://issues.apache.org/jira/browse/HIVE-9002
             Project: Hive
          Issue Type: Bug
            Reporter: Pengcheng Xiong
            Assignee: Pengcheng Xiong


Right now if we have
select col from A
union all
select col from B [Operator]

it is treated as

(select col from A)
union all
(select col from B [Operator])

Although it is correct for where, group by (having) join operators, it is not correct for order by and limit operators. They should be

(select col from A
union all
select col from B) [order by, limit]




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