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https://issues.apache.org/jira/browse/HIVE-25485?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HIVE-25485:
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Labels: pull-request-available (was: )
> 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
> Time Spent: 10m
> 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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