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Posted to dev@calcite.apache.org by "Rui Wang (Jira)" <ji...@apache.org> on 2020/01/16 20:05:00 UTC

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

Rui Wang created CALCITE-3743:
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             Summary: 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


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: 

the function returns relative rank of the current row: (rank - 1) / (total partition rows - 1)

The return value should be double.




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