aljoscha commented on issue #8721: [FLINK-12823][datastream] PartitionTransformation supports DataExchan… URL: https://github.com/apache/flink/pull/8721#issuecomment-501685197 I think we should not reuse the existing `DataExchangeMode` because it is a runtime class in the `flink-runtime` package. At some point we want to decouple the `StreamTransformations` and the `DataStream` API from runtime so we should not introduce more dependencies. I would suggest to add a new enum next to `PartitionTransformation` (in the same package) for this purpose, it should probably also be declared `@PublicEvolving`.
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