Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1585#discussion_r51870482
--- Diff:
flink-java/src/main/java/org/apache/flink/api/java/operators/SortPartitionOperator.java
---
@@ -89,6 +100,22 @@ public SortPartitionOperator(DataSet<T> dataSet, String
sortField, Order sortOrd
return this;
}
+ /**
+ * Appends an additional sort order with the specified field in the
specified order to the
+ * local partition sorting of the DataSet.
+ *
+ * @param keyExtractor The KeySelector function which extracts the key
value of the additional
+ * sort order of the local partition sorting.
+ * @param order The order of the additional sort order of the local
partition sorting.
+ * @return The DataSet with sorted local partitions.
+ */
+ public <K> SortPartitionOperator<T> sortPartition(KeySelector<T, K>
keyExtractor, Order order) {
--- End diff --
I would not allow chaining.
In addition, we must make sure that `ExpressionKeys` and
`SelectorFunctionKeys` are not mixed. So you can either use a single key
selector or one or more expression keys.
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