[jira] [Comment Edited] (CALCITE-3743) Support PERCENT_RANK window aggregate function

["Rui Wang (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-3743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17017445#comment-17017445 ] 

Rui Wang edited comment on CALCITE-3743 at 1/16/20 8:17 PM:
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Question: which class is the place to test such implementation?

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update:

I found winagg.iq is a appropriate place.


was (Author: amaliujia):
Question: which class is the place to test such implementation?

> Support PERCENT_RANK window aggregate function
> ----------------------------------------------
>
>                 Key: CALCITE-3743
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3743
>             Project: Calcite
>          Issue Type: Task
>            Reporter: Rui Wang
>            Assignee: Rui Wang
>            Priority: Major
>
> It seems like Calcite does not have an implementation of PERCENT_RANK: see the list of implemented window aggregate function: https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/adapter/enumerable/RexImpTable.java#L635
> Did a quick check and MySQL, Postgresql, Oracle, BigQuery all support it. The definition is consistent: 
> {code:java}
> the function returns relative rank of the current row: (rank - 1) / (total partition rows - 1)
> {code}
> The return value should be double.



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