Timo Walther created FLINK-4604:
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Summary: 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
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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