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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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