[jira] [Assigned] (HIVE-2339) Preserve RS key columns in columnExprMap after CP optimization, which might be useful to other optimizers

["John Sichi (Assigned) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-2339?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

John Sichi reassigned HIVE-2339:
--------------------------------

    Assignee: Navis
    
> Preserve RS key columns in columnExprMap after CP optimization, which might be useful to other optimizers
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-2339
>                 URL: https://issues.apache.org/jira/browse/HIVE-2339
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Query Processor
>            Reporter: Navis
>            Assignee: Navis
>            Priority: Trivial
>             Fix For: 0.9.0
>
>         Attachments: HIVE-2339.1.patch
>
>
> 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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