Github user shaoxuan-wang commented on the issue:
https://github.com/apache/flink/pull/3993
@fhueske @sunjincheng121 @wuchong, thanks for the valuable inputs. We
talked offline and get an agreement that we'd better to put
`getAccumulatorType()`, `getResultType()` etc. in `AggregateFunction`. Sorry
that I forgot to update this Jira. Let us move this change to
[FLINK-7194](https://issues.apache.org/jira/browse/FLINK-7194). I will close
this PR and [FLINK-6725](https://issues.apache.org/jira/browse/FLINK-6725).
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