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Posted to dev@hive.apache.org by "Zoltan Haindrich (Jira)" <ji...@apache.org> on 2021/08/26 14:35:00 UTC

[jira] [Created] (HIVE-25485) Transform selects of literals under a UNION ALL to inline table scan

Zoltan Haindrich created HIVE-25485:
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             Summary: Transform selects of literals under a UNION ALL to inline table scan
                 Key: HIVE-25485
                 URL: https://issues.apache.org/jira/browse/HIVE-25485
             Project: Hive
          Issue Type: Improvement
            Reporter: Zoltan Haindrich
            Assignee: Zoltan Haindrich



{code}
select 1
union all
select 1
union all
[...]
union all
select 1
{code}

results in a very big plan; which will have vertexes proportional to the number of union all branch - hence it could be slow to execute it



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