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From "Navis (Reopened) (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (HIVE-2339) Preserve RS key columns in columnExprMap after CP optimization, which might be useful to other optimizers
Date Thu, 01 Dec 2011 05:27:40 GMT

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

Navis reopened HIVE-2339:
-------------------------


It seemed to be fixed by HIVE-1989. It was true for join cases but for group-by cases, mapping
information of keys are still missing.
                
> 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
>            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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