Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1848#discussion_r58895362
--- Diff:
flink-java/src/main/java/org/apache/flink/api/java/operators/PartitionOperator.java
---
@@ -98,6 +101,14 @@ public PartitionOperator(DataSet<T> input, Keys<T>
pKeys, Partitioner<?> customP
this.customPartitioner = customPartitioner;
this.distribution = distribution;
}
+
+ public PartitionOperator<T> withOrders(Order... orders) {
--- End diff --
We should check that the number of `orders` is the same as the number of
specified keys. Unfortunately, this is not as trivial as it sounds, because
`Keys` does not give access to the the originally specified keys but only to
the flattened logical keys. If a program specifies a `Tuple2<Long, Long>` as
key, it will only specify a single order but the logical keys will be flattened
to `[Long, Long]`. I think we should extend the `Keys` class by a method
`TypeInformation<?>[] getOriginalKeyFieldTypes()` which returns the unflattened
field types. Using that method we can see how many flat fields exist for each
specified key field.
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