Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/2976#discussion_r94963463
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/AggregateReduceGroupFunction.scala
---
@@ -20,26 +20,29 @@ package org.apache.flink.table.runtime.aggregate
import java.lang.Iterable
import org.apache.flink.api.common.functions.RichGroupReduceFunction
-import org.apache.flink.types.Row
import org.apache.flink.configuration.Configuration
+import org.apache.flink.types.Row
import org.apache.flink.util.{Collector, Preconditions}
import scala.collection.JavaConversions._
/**
- * It wraps the aggregate logic inside of
+ * It wraps the aggregate logic inside of
* [[org.apache.flink.api.java.operators.GroupReduceOperator]].
*
- * @param aggregates The aggregate functions.
- * @param groupKeysMapping The index mapping of group keys between
intermediate aggregate Row
- * and output Row.
- * @param aggregateMapping The index mapping between aggregate function
list and aggregated value
- * index in output Row.
+ * @param aggregates The aggregate functions.
+ * @param groupKeysMapping The index mapping of group keys between
intermediate aggregate Row
+ * and output Row.
+ * @param aggregateMapping The index mapping between aggregate function
list and aggregated value
+ * index in output Row.
+ * @param groupingSetsMapping The index mapping of keys in grouping sets
between intermediate
--- End diff --
It is not documented that this parameter can be null. I would recommend to
use an `Option` here.
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