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https://issues.apache.org/jira/browse/FLINK-5315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16560764#comment-16560764
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Hequn Cheng commented on FLINK-5315:
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[~walterddr] Hi, I think the truth is we can never write a \{{a.distinct}}
expression. It is not valid. Because there are no aggregations return multi
rows. It is only valid to do \{{a.count}}. And the difference between
\{{a.agg.distinct}} and \{{a.agg}} is whether it is a distinct-agg. I think the
semantic is very clear. What do you think? :)
> Support distinct aggregations in table api
> ------------------------------------------
>
> Key: FLINK-5315
> URL: https://issues.apache.org/jira/browse/FLINK-5315
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: Kurt Young
> Assignee: Rong Rong
> Priority: Major
>
> Such as
> {code}
> t.select("count(distinct a), sum(b)")
> {code}
> or
> {code}
> t.select('a.count.distinct), 'b.sum)
> {code}
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