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https://issues.apache.org/jira/browse/FLINK-4017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15318695#comment-15318695
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Chesnay Schepler commented on FLINK-4017:
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when using the python API data always exists as a byte array on the java side.
you will either have to
* implement the aggregation on the python side
* apply a deserializationMap, groupBy, aggregate, and serializationMap on the
java side.
> [py] Add Aggregation support to Python API
> ------------------------------------------
>
> Key: FLINK-4017
> URL: https://issues.apache.org/jira/browse/FLINK-4017
> Project: Flink
> Issue Type: Improvement
> Components: Python API
> Reporter: Geoffrey Mon
> Priority: Minor
>
> Aggregations are not currently supported in the Python API.
> I was getting started with setting up and working with Flink and figured this
> would be a relatively simple task for me to get started with. Currently
> working on this at https://github.com/geofbot/flink
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