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Posted to issues@flink.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2017/05/02 15:06:04 UTC
[jira] [Commented] (FLINK-4604) Add support for standard
deviation/variance
[ https://issues.apache.org/jira/browse/FLINK-4604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15993043#comment-15993043 ]
ASF GitHub Bot commented on FLINK-4604:
---------------------------------------
Github user twalthr commented on the issue:
https://github.com/apache/flink/pull/3260
Thanks for the update @ex00. I will go through your changes and merge this tomorrow.
> 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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