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https://issues.apache.org/jira/browse/FLINK-4604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15615280#comment-15615280
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Anton Mushin commented on FLINK-4604:
-------------------------------------
I found rootcause
problems occur only in query with SUM, if in query replace SUM to $SUM0 (or any
aggregate function) then query works.
At time execute {{AggregateReduceFunctionsRule#onMatch}} SUM must replace to
$SUM0
[here|https://github.com/apache/calcite/blob/0938c7b6d767e3242874d87a30d9112512d9243a/core/src/main/java/org/apache/calcite/rel/rules/AggregateReduceFunctionsRule.java#L338]
But it is not happening because the types in FLINK is nullable. ( in my case)
I do not know how to solve this problem yet, please let me know if you have
idea how resolve this problem.
> 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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