Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3733#discussion_r113049009
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/DataSetSessionWindowAggReduceGroupFunction.scala
---
@@ -66,7 +66,7 @@ class DataSetSessionWindowAggReduceGroupFunction(
private var aggregateBuffer: Row = _
private var output: Row = _
- private var collector: TimeWindowPropertyCollector = _
+ private var collector: TimeWindowPropertyCollector[Row] = _
--- End diff --
We can make `TimeWindowPropertyCollector` abstract and implement two
versions, one for `Row` and one for `CRow`
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