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https://issues.apache.org/jira/browse/HIVE-25311?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltan Haindrich resolved HIVE-25311.
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Fix Version/s: 4.0.0
Resolution: Fixed
merged into master. Thank you [~kkasa] for reviewing the changes!
> Slow compilation of union operators with >100 branches
> ------------------------------------------------------
>
> Key: HIVE-25311
> URL: https://issues.apache.org/jira/browse/HIVE-25311
> Project: Hive
> Issue Type: Improvement
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> during the processing of an N way union operator the full plan is cloned N
> times; which might hurt compilation time performance
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