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https://issues.apache.org/jira/browse/HIVE-23999?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stamatis Zampetakis reassigned HIVE-23999:
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> Unify the code creating single and multi column semijoin reducers
> -----------------------------------------------------------------
>
> Key: HIVE-23999
> URL: https://issues.apache.org/jira/browse/HIVE-23999
> Project: Hive
> Issue Type: Improvement
> Reporter: Stamatis Zampetakis
> Assignee: Stamatis Zampetakis
> Priority: Major
>
> In HIVE-21196, we add a transformation capable of merging single column
> semijoin reducers to multi column semijoin reducer.
> The code for creating multi-column semijoin reducers in
> SemiJoinReductionMerge presents some similarities with the code creating
> single-column semijoin reducers in DynamicPartitionPruningOptimization.
> Possibly we could refactor the respective parts to unify the creation logic
> of semijoin reducers.
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