Github user shaoxuan-wang commented on the issue:
     @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]( I will close 
this PR and [FLINK-6725]( 

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