Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1585#discussion_r51870056
--- Diff: flink-java/src/main/java/org/apache/flink/api/java/DataSet.java
---
@@ -1377,6 +1377,20 @@ public long count() throws Exception {
return new SortPartitionOperator<>(this, field, order,
Utils.getCallLocationName());
}
+ /**
+ * Locally sorts the partitions of the DataSet on the specified field
in the specified order.
+ * DataSet can be sorted on multiple fields by chaining sortPartition()
calls.
--- End diff --
I would not allow chaining of KeySelectors. We only allow a single key
extractor anywhere else in the DataSet API (for a good reason). If users want
to sort on more than one field, they can return a `TupleX` from the
`KeySelector`.
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