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https://issues.apache.org/jira/browse/HIVE-2592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13156537#comment-13156537
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Phabricator commented on HIVE-2592:
-----------------------------------

jonchang has commented on the revision "HIVE-2592 [jira] ConstantOI doesn't 
always propagate to UDAF".

  Maybe someone with some more depth on the history here can chime in, but it 
seems to me that if the TI/OI split was intended to solve the problem, it's a 
pretty broken solution.

REVISION DETAIL
  https://reviews.facebook.net/D513

                
> ConstantOI doesn't always propagate to UDAF
> -------------------------------------------
>
>                 Key: HIVE-2592
>                 URL: https://issues.apache.org/jira/browse/HIVE-2592
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Jonathan Chang
>            Assignee: Jonathan Chang
>         Attachments: HIVE-2592.D513.1.patch, HIVE-2592.D513.2.patch
>
>
> Depending on the query plan, a UDAF may not actually get a constant OI.  E.g.,
> set hive.map.aggr=false;
> SELECT percentile_approx(cast(substr(src.value,5) AS double), 0.5) FROM src;

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