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https://issues.apache.org/jira/browse/HIVE-9636?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesus Camacho Rodriguez resolved HIVE-9636.
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Resolution: Invalid
> Apply IdentityProjectRemover after other optimizations
> ------------------------------------------------------
>
> Key: HIVE-9636
> URL: https://issues.apache.org/jira/browse/HIVE-9636
> Project: Hive
> Issue Type: Bug
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
> Attachments: HIVE-9636.patch
>
>
> IdentityProjectRemove optimizer may remove some Project operators that change
> the table alias for the input columns; this might cause optimizations such as
> StatsOptimizer, that rely on colExprMap and consequently store table aliases,
> to behave incorrectly.
> To avoid this, we could apply IdentityProjectRemove optimization after all
> the rest have been previously applied, and document it accordingly.
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