ASF GitHub Bot commented on FLINK-6725:

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](https://issues.apache.org/jira/browse/FLINK-7194). I will close 
this PR and [FLINK-6725](https://issues.apache.org/jira/browse/FLINK-6725). 

> make requiresOver as a contracted method in udagg
> -------------------------------------------------
>                 Key: FLINK-6725
>                 URL: https://issues.apache.org/jira/browse/FLINK-6725
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>            Reporter: Shaoxuan Wang
>            Assignee: Shaoxuan Wang
> I realized requiresOver is defined in the udagg interface when I wrote up the 
> udagg doc. I would like to put requiresOver as a contract method. This makes 
> the entire udagg interface consistently and clean.

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