Github user haohui commented on the issue:
https://github.com/apache/flink/pull/3252
Discussed with @fhueske offline. Thanks a lot for the comments. The V4 PR
implements the following:
* Rebased on top of #3101
* `LogicalWindowAggregateRule` implements `RelOptRule` instead of the
`ConvertRule`.
* Instead of adding a new field in `LogicalWindowAggregate`, the
implementation now transforms the original `LogicalAggregate(LogicalProject())`
expression to `LogicalProject(LogicalWindowAggregate(LogicalProject(...)))`.
The outermost projection ensures that the operators have the same row types
before and after the transformation.
Please take another look.
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