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https://issues.apache.org/jira/browse/HIVE-13021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15143672#comment-15143672
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Prasanth Jayachandran commented on HIVE-13021:
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lgmt, +1
> GenericUDAFEvaluator.isEstimable(agg) always returns false
> ----------------------------------------------------------
>
> Key: HIVE-13021
> URL: https://issues.apache.org/jira/browse/HIVE-13021
> Project: Hive
> Issue Type: Bug
> Components: UDF
> Affects Versions: 1.2.1
> Reporter: Sergey Zadoroshnyak
> Assignee: Gopal V
> Priority: Critical
> Labels: Performance
> Attachments: HIVE-13021.1.patch
>
>
> GenericUDAFEvaluator.isEstimable(agg) always returns false, because
> annotation AggregationType has default RetentionPolicy.CLASS and cannot be
> retained by the VM at run time.
> As result estimate method will never be executed.
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