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https://issues.apache.org/jira/browse/HIVE-25370?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltan Haindrich reassigned HIVE-25370:
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> Improve SharedWorkOptimizer performance
> ---------------------------------------
>
> Key: HIVE-25370
> URL: https://issues.apache.org/jira/browse/HIVE-25370
> Project: Hive
> Issue Type: Improvement
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
>
> for queries which are unioning ~800 constant rows the SWO is doing around
> n*n/2 operations trying to find 2 TS-es which could be merged
> {code}
> select constants
> UNION ALL
> ...
> UNION ALL
> select constants
> {code}
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