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https://issues.apache.org/jira/browse/FLINK-7578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16318021#comment-16318021
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Hequn Cheng commented on FLINK-7578:
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[~sunjincheng121] Hi, thanks for your information. I will check it and close
this JIRA if this issue has been solved.
> WindowStream should support rich AggregateFunction
> --------------------------------------------------
>
> Key: FLINK-7578
> URL: https://issues.apache.org/jira/browse/FLINK-7578
> Project: Flink
> Issue Type: Improvement
> Components: DataStream API, Table API & SQL
> Reporter: Hequn Cheng
>
> Currently, {{WindowedStream}} does not support Rich AggregateFunction which
> makes users can not use user defined aggregate functions in table-api/sql.
> Because user code class loader is beyond reach in {{AggregateAggFunction}}.
> As shown in the following example,
> {quote}
> select a,udagg1(b), udagg2(c)
> from Table as T
> GROUP BY a, TUMBLE(processTime, interval '1' minute);
> {quote}
> Exceptions will be throwed when call {{initFunction()}} in
> {{AggregateAggFunction}}.
> As user defined aggregations are widely used in table-api/sql, it is valuable
> to support Rich AggregateFunction for {{WindowStream}}.
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