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https://issues.apache.org/jira/browse/HIVE-5784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13817630#comment-13817630
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Xuefu Zhang commented on HIVE-5784:
-----------------------------------
[~rhbutani] This seems a dupe of HIVE-3107, which keeps the previous
discussions. There is no point to keep two. Feel free to close this one and
take that one if you're are going to work on this now.
> Group By Operator doesn't carry forward table aliases in its RowResolver
> ------------------------------------------------------------------------
>
> Key: HIVE-5784
> URL: https://issues.apache.org/jira/browse/HIVE-5784
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Harish Butani
> Assignee: Harish Butani
> Attachments: HIVE-5784.1.patch
>
>
> The following queries fails:
> {code}
> select b.key, count(*) from src b group by key
> select key, count(*) from src b group by b.key
> {code}
> with a SemanticException; the select expression b.key (key in the 2nd query)
> are not resolved by the GBy RowResolver.
> This is because the GBy RowResolver only supports resolving based on an
> AST.toStringTree match. Underlying issue is that a RowResolver doesn't allow
> multiple mappings to the same ColumnInfo.
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