[jira] [Commented] (CALCITE-4163) Unify the code creating single and multi column semijoin reducers

["Rui Wang (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-4163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17172564#comment-17172564 ] 

Rui Wang commented on CALCITE-4163:
-----------------------------------

no worries :-) I occasionally did the same before (Should be Beam but create in Calcite).

> Unify the code creating single and multi column semijoin reducers
> -----------------------------------------------------------------
>
>                 Key: CALCITE-4163
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4163
>             Project: Calcite
>          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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