Anton Mushin updated FLINK-4604:
    Comment: was deleted

(was: what if do try return the type of source column instead null?)

> Add support for standard deviation/variance
> -------------------------------------------
>                 Key: FLINK-4604
>                 URL: https://issues.apache.org/jira/browse/FLINK-4604
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>            Reporter: Timo Walther
>            Assignee: Anton Mushin
>         Attachments: 1.jpg
> Calcite's {{AggregateReduceFunctionsRule}} can convert SQL {{AVG, STDDEV_POP, 
> STDDEV_SAMP, VAR_POP, VAR_SAMP}} to sum/count functions. We should add, test 
> and document this rule. 
> If we also want to add this aggregates to Table API is up for discussion.

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