[jira] [Created] (FLINK-7578) WindowStream should support rich AggregateFunction

[Shang Yuanchun (Jira)]

Hequn Cheng created FLINK-7578:
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             Summary: 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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