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https://issues.apache.org/jira/browse/HIVE-13021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15155368#comment-15155368
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Pengcheng Xiong commented on HIVE-13021:
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[~gopalv], thanks for your fast response. Please correct me if my understanding
is wrong: if this patch breaks any test cases on master, they should be
revolved before checked in, right? :)
> 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
> Fix For: 1.3.0, 2.1.0
>
> 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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