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https://issues.apache.org/jira/browse/HIVE-15617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15822141#comment-15822141
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Aihua Xu commented on HIVE-15617:
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patch-1: avg() will first call sum() to get the sum and then calculate the
average from sum/num_of_rows.
> Improve the avg performance for Range based window
> --------------------------------------------------
>
> Key: HIVE-15617
> URL: https://issues.apache.org/jira/browse/HIVE-15617
> Project: Hive
> Issue Type: Sub-task
> Components: PTF-Windowing
> Affects Versions: 1.0.0
> Reporter: Aihua Xu
> Assignee: Aihua Xu
> Attachments: HIVE-15617.1.patch
>
>
> Similar to HIVE-15520, we need to improve the performance for avg().
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