Preserve RS key columns in columnExprMap in CP, which might be useful to other
optimizers
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Key: HIVE-2339
URL: https://issues.apache.org/jira/browse/HIVE-2339
Project: Hive
Issue Type: Sub-task
Reporter: Navis
Priority: Trivial
In ColumnPrunerProcFactory#pruneReduceSinkOperator, only VALUE parts are
retained from columnExprMap. Doesn't anyone want KEY parts to retained, either?
In my case, it was very useful for backtracking column names and removing RS in
*-RS-*-RS-GBY case.
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