Github user fhueske commented on a diff in the pull request: https://github.com/apache/flink/pull/4625#discussion_r142681690 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/datastream/DataStreamWindowJoin.scala --- @@ -152,19 +176,40 @@ class DataStreamWindowJoin( } } - def createProcTimeInnerJoinFunction( + def createEmptyInnerJoin( --- End diff -- please add the return type for the method `DataStream[CRow]`
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