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