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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