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https://issues.apache.org/jira/browse/HIVE-8179?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gunther Hagleitner updated HIVE-8179:
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Status: Patch Available (was: Open)
> Fetch task conversion: Remove some dependencies on AST
> ------------------------------------------------------
>
> Key: HIVE-8179
> URL: https://issues.apache.org/jira/browse/HIVE-8179
> Project: Hive
> Issue Type: Bug
> Reporter: Gunther Hagleitner
> Assignee: Gunther Hagleitner
> Attachments: HIVE-8179.1.patch, HIVE-8179.2.patch, HIVE-8179.3.patch
>
>
> fetch task conversion is does some strange things:
> For instance: select * from (select * from x) t, wont get converted even
> though it's the exact same operator plan as: select * from x.
> Or: select * from foo will get converted with minimal, but select <list all
> columns of foo> from foo won't.
> We also check the AST for group by etc, but then do the same thing in the
> operator tree again.
> I'm also wondering why we ship with "moar" as default, but test with
> "minimal" in the unit tests.
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