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https://issues.apache.org/jira/browse/HIVE-460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714815#action_12714815
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He Yongqiang commented on HIVE-460:
-----------------------------------
Currently 'a+b' is used whether there an alias or not. '+' is not replaced
because '+' is treated as a legal character.
But 'sum(substr(kv1.value,5))' is replaced with sum_substr_kv1.value_5__.
Comma, blank, left-parenthesis, and right-parenthesis are now treated as
illegal characters and will be replaced with '_'.
And i noticed that KEY. and VALUE. are added between a mapreduce boundary, can
we remove them?
> 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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