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https://issues.apache.org/jira/browse/FLINK-6725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16032379#comment-16032379
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ASF GitHub Bot commented on FLINK-6725:
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Github user wuchong commented on the issue:
https://github.com/apache/flink/pull/3993
Regarding to (3), I agree with Fabian. From a user's perspective, it is not
easy to implement a `getAccumulatorType()` or `getResultType()` contract
function, as the signature and return type is complicated.
> 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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