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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