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From "Timo Walther (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-4604) Add support for standard deviation/variance
Date Fri, 09 Sep 2016 11:48:20 GMT
Timo Walther created FLINK-4604:
-----------------------------------

             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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