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https://issues.apache.org/jira/browse/CALCITE-3743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17017667#comment-17017667
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Feng Zhu commented on CALCITE-3743:
-----------------------------------
It duplicates with CALCITE-2414.
> Implement PERCENT_RANK window aggregate function
> ------------------------------------------------
>
> Key: CALCITE-3743
> URL: https://issues.apache.org/jira/browse/CALCITE-3743
> Project: Calcite
> Issue Type: Bug
> 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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