Github user fhueske commented on a diff in the pull request: https://github.com/apache/flink/pull/3252#discussion_r100995825 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/datastream/DataStreamAggregateRule.scala --- @@ -159,9 +152,25 @@ class LogicalWindowAggregateRule } false } + + private def rewriteTimeIndicatorOperators(agg: LogicalAggregate, groupExprIdx: Int) = { + val project = agg.getInput.asInstanceOf[HepRelVertex].getCurrentRel.asInstanceOf[LogicalProject] + val newProjectExpr = mutable.ArrayBuffer[RexNode]() + newProjectExpr.appendAll(project.getChildExps) + val rexBuilder = agg.getCluster.getRexBuilder + newProjectExpr(groupExprIdx) = rexBuilder.makeTimestampLiteral( + DataStreamAggregateRule.TIMESTAMP_ZERO, 3) + val newProject = project.copy(project.getTraitSet, project.getInput, + newProjectExpr, project.getRowType) + + agg.copy(agg.getTraitSet, List(newProject)).asInstanceOf[LogicalAggregate] --- End diff -- Can we create here a `LogicalAggregate` with adapted `groupSet`? I think adding the `windowingGroupSet` to the `LogicalWindowAggregate` is not a very nice solution. It would be better if we could keep the existing code as it is without introducing workarounds for the SQL case.
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