Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1600#discussion_r52304994
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/plan/rules/dataset/DataSetAggregateRule.scala
---
@@ -37,14 +39,24 @@ class DataSetAggregateRule
val traitSet: RelTraitSet =
rel.getTraitSet.replace(DataSetConvention.INSTANCE)
val convInput: RelNode = RelOptRule.convert(agg.getInput,
DataSetConvention.INSTANCE)
- new DataSetReduce(
+ val grouping = agg.getGroupSet.asList().map {
--- End diff --
I think you can use `ImmutableBitSet.toArray` to directly generate an int[].
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