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Posted to dev@calcite.apache.org by "Stamatis Zampetakis (Jira)" <ji...@apache.org> on 2020/08/06 13:27:00 UTC

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

Stamatis Zampetakis created CALCITE-4163:
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             Summary: 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


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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