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From "Hequn Cheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7578) WindowStream should support rich AggregateFunction
Date Tue, 09 Jan 2018 08:30:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16318021#comment-16318021

Hequn Cheng commented on FLINK-7578:

[~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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