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From "Jesus Camacho Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HIVE-9636) Apply IdentityProjectRemover after other optimizations
Date Mon, 28 May 2018 17:05:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-9636?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jesus Camacho Rodriguez resolved HIVE-9636.
-------------------------------------------
    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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