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From "Phabricator (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2592) ConstantOI doesn't always propagate to UDAF
Date Tue, 22 Nov 2011 17:16:40 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13155269#comment-13155269
] 

Phabricator commented on HIVE-2592:
-----------------------------------

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

  I dunno if there are any valid uses of TypeInfo.

  Anyhow, this diff gets part of the way towards fixing the other issue (constant OI into
partial aggregates), but the serialization still needs to be fixed.

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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