Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1517#discussion_r64667048
--- Diff:
flink-java/src/main/java/org/apache/flink/api/java/operators/UnsortedGrouping.java
---
@@ -135,10 +136,37 @@ public UnsortedGrouping(DataSet<T> set, Keys<T> keys)
{
* @see DataSet
*/
public ReduceOperator<T> reduce(ReduceFunction<T> reducer) {
+ return reduce(Utils.getCallLocationName(), reducer,
CombineHint.OPTIMIZER_CHOOSES);
+ }
+
+ /**
+ * Applies a Reduce transformation on a grouped {@link DataSet}.<br>
+ * For each group, the transformation consecutively calls a {@link
org.apache.flink.api.common.functions.RichReduceFunction}
+ * until only a single element for each group remains.
+ * A ReduceFunction combines two elements into one new element of the
same type.
+ *
+ * @param reducer The ReduceFunction that is applied on each group of
the DataSet.
+ * @param strategy The strategy that should be used to execute the
combine phase of the reduce.
+ * If {@code null} is given, then the optimizer will
pick the strategy.
+ * @return A ReduceOperator that represents the reduced DataSet.
+ *
+ * @see org.apache.flink.api.common.functions.RichReduceFunction
+ * @see ReduceOperator
+ * @see DataSet
+ */
+ public ReduceOperator<T> reduce(ReduceFunction<T> reducer, CombineHint
strategy) {
--- End diff --
The `ReduceOperator.setCombineHint(CombineHint)` method should be annotated
with `@PublicEvolving`.
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