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https://issues.apache.org/jira/browse/HIVE-10141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14606470#comment-14606470
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Yin Huai commented on HIVE-10141:
---------------------------------
Looking at
https://github.com/apache/hive/blob/release-1.2.1/ql/src/java/org/apache/hadoop/hive/ql/parse/IdentifiersParser.g#L195-L198.
Seems window spec is dropped.
> count(distinct) not supported in Windowing function
> ---------------------------------------------------
>
> Key: HIVE-10141
> URL: https://issues.apache.org/jira/browse/HIVE-10141
> Project: Hive
> Issue Type: Improvement
> Components: PTF-Windowing
> Affects Versions: 1.0.0
> Reporter: Yi Zhang
> Priority: Critical
>
> Count(distinct) is a very important function for analysis. For example,
> unique visitors instead of total visitors. Currently it is missing in
> Windowing function.
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