[jira] [Commented] (FLINK-3475) DISTINCT aggregate function support for SQL queries

["Zhenghua Gao (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-3475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15823352#comment-15823352 ] 

Zhenghua Gao commented on FLINK-3475:
-------------------------------------

I have created a pr for this issue: https://github.com/apache/flink/pull/3111.
Currently, calcite's AggregateExpandDistinctAggregatesRule can help flink to support distinct aggregate SQL.
After do some tests, i find some bad cases which described in https://issues.apache.org/jira/browse/CALCITE-1558.
So I copied the calcite class to flink project and did a quick fix.

> DISTINCT aggregate function support for SQL queries
> ---------------------------------------------------
>
>                 Key: FLINK-3475
>                 URL: https://issues.apache.org/jira/browse/FLINK-3475
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>            Reporter: Chengxiang Li
>            Assignee: Zhenghua Gao
>
> DISTINCT aggregate function may be able to reuse the aggregate function instead of separate implementation, and let Flink runtime take care of duplicate records.



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