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From "Gabor Gevay (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4575) DataSet aggregate methods should support POJOs
Date Sun, 12 Nov 2017 14:27:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16248874#comment-16248874
] 

Gabor Gevay commented on FLINK-4575:
------------------------------------

[~vcycyv], I'm not sure how would {{getFlatFields}} help here. (How would you convert back
to POJO at the end?)

But if you would like to work on this jira, then the approach outlined in the jira description
should work. I think this is the cleanest solution, since {{FieldAccessor}} is exactly for
situations like we have here, where we have to get and set a field, based on a field expression.
However, you would have to resolve https://issues.apache.org/jira/browse/FLINK-4578 first.
I think that could be resolved by the solution that I wrote in a comment there.

> DataSet aggregate methods should support POJOs
> ----------------------------------------------
>
>                 Key: FLINK-4575
>                 URL: https://issues.apache.org/jira/browse/FLINK-4575
>             Project: Flink
>          Issue Type: Improvement
>          Components: DataSet API
>            Reporter: Gabor Gevay
>            Priority: Minor
>              Labels: starter
>
> The aggregate methods of DataSets (aggregate, sum, min, max) currently only support Tuples,
with the fields specified by indices. With https://issues.apache.org/jira/browse/FLINK-3702
resolved, adding support for POJOs and field expressions would be easy: {{AggregateOperator}}
would create {{FieldAccessors}} instead of just storing field positions, and {{AggregateOperator.AggregatingUdf}}
would use these {{FieldAccessors}} instead of the Tuple field access methods.



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