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From "Prasad Chakka (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-460) Improve ColumnPruner to prune more aggressively and keep column information for input tables
Date Tue, 02 Jun 2009 20:35:07 GMT

    [ https://issues.apache.org/jira/browse/HIVE-460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12715667#action_12715667
] 

Prasad Chakka commented on HIVE-460:
------------------------------------

then why not use 'a+b' for display and internal names _0 etc in type defs and thrift DDLs.
You can add displayName field to exprNodeDesc and use that field instead of column name while
printing out the expression.

IMO, using translated column names instead of position names actually be more confusing if
two expressions are similar.

> Improve ColumnPruner to prune more aggressively and keep column information for input
tables
> --------------------------------------------------------------------------------------------
>
>                 Key: HIVE-460
>                 URL: https://issues.apache.org/jira/browse/HIVE-460
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Query Processor
>    Affects Versions: 0.4.0
>            Reporter: Zheng Shao
>            Assignee: He Yongqiang
>         Attachments: hive-460-2009-05-29-noaliasallowed.patch, HIVE-460.1.patch
>
>
> This is required for column-based table format.

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