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Posted to dev@hive.apache.org by GitBox <gi...@apache.org> on 2019/03/12 21:21:00 UTC

[GitHub] [hive] vineetgarg02 opened a new pull request #567: HIVE-21382: Group by keys reduction optimization - keys are not reduced in query23

vineetgarg02 opened a new pull request #567: HIVE-21382: Group by keys reduction optimization - keys are not reduced in query23
URL: https://github.com/apache/hive/pull/567
 
 
   [HIVE-21382](https://issues.apache.org/jira/browse/HIVE-21382)
   Further enhancements to Group by key reduction in presence of PK/UNIQUE constraints. This patch enables reducing keys in following cases:
   * If group by keys originate from multiple tables (e.g. GBY after JOIN)
   * If group by keys contain deterministic expression 

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