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

["Zoltan Haindrich (Jira)" <ji...@apache.org>]

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

Zoltan Haindrich resolved HIVE-25485.
-------------------------------------
    Fix Version/s: 4.0.0
       Resolution: Fixed

merged into master. Thank you [~kkasa] for reviewing the changes!

> 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
>              Labels: pull-request-available
>             Fix For: 4.0.0
>
>          Time Spent: 1.5h
>  Remaining Estimate: 0h
>
> {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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