jcamachor commented on issue #819: HIVE-22363 ReduceDeduplication may leave an invalid GroupByOperator behind in some cases URL: https://github.com/apache/hive/pull/819#issuecomment-544769886 @kgyrtkirk , I left some comments. I still do not understand the problem we were having with Filter operator. Could you describe how the plan was looking before and after, and what we are trying to accomplish? Were we producing incorrect results? Were we missing a possible optimization?
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