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https://issues.apache.org/jira/browse/FLINK-4575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15463360#comment-15463360
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Gabor Gevay commented on FLINK-4575:
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This is a bit harder than I thought, because of adding the ForwardedFields
property in case of the aggregation field not being the same as the key field.
Note, that the old logic of determining this has a bug:
https://issues.apache.org/jira/browse/FLINK-4578
> 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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