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https://issues.apache.org/jira/browse/FLINK-10250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16596089#comment-16596089
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Fabian Hueske commented on FLINK-10250:
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Hi [~LaiAng], Thanks for your questions and welcome to the Flink community.
*Please register at the [user mailing
list|https://flink.apache.org/community.html#mailing-lists] and post them
there.*
The Flink community does not use Jira as a discussion forum but as a tracker
for bugs, improvements, and features.
Flink won't support {{RichAggregateFunction}} because the function is
internally used to combine state at different places. Hence, users cannot
reason about where and when methods like {{open()}} (which might have side
effects) are invoked.
I'll close this issue as "Not an Issue".
Thanks, Fabian
> Flink doesn't support functions that extend RichAggregateFunction in a group
> window
> -----------------------------------------------------------------------------------
>
> Key: FLINK-10250
> URL: https://issues.apache.org/jira/browse/FLINK-10250
> Project: Flink
> Issue Type: Improvement
> Components: DataStream API
> Affects Versions: 1.5.2, 1.5.3, 1.6.0
> Reporter: PengYang
> Priority: Major
>
> Flink doesn't support functions that extend RichAggregateFunction in a group
> window，in the RichAggregateFunction via state store data and fliter out the
> duplicate data .The Flink will support this feature in a future release？There
> is another question whether flink supports global state state query in the
> future？If flink supports global state queries, it can replace redis these
> external caches In certain aspects.Maybe my thoughts are a little naive, but
> I hope that the function of flink is getting better and better
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