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https://issues.apache.org/jira/browse/HIVE-460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714840#action_12714840
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Zheng Shao commented on HIVE-460:
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There should still be 2 names: one for display to our users (display name), and
one for internal processing (internal name). Display name can be the same as
the expression, but internal name cannot, because we need to use that to
construct type definition and thrift DDLs - fields have to have valid names.
> 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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