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https://issues.apache.org/jira/browse/HIVE-2592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13154436#comment-13154436
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John Sichi commented on HIVE-2592:
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Sure.
> 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
>
> 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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