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

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

     [ https://issues.apache.org/jira/browse/HIVE-25485?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zoltan Haindrich reassigned HIVE-25485:
---------------------------------------


> 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
>            Priority: Major
>
> {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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