Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1838#discussion_r59752679
--- Diff:
flink-java/src/main/java/org/apache/flink/api/java/operators/PartitionOperator.java
---
@@ -84,8 +84,8 @@ public PartitionOperator(DataSet<T> input, Keys<T> pKeys,
Partitioner<?> customP
Preconditions.checkArgument(distribution == null || pMethod ==
PartitionMethod.RANGE, "Customized data distribution is only neccessary for
range partition.");
if (distribution != null) {
-
Preconditions.checkArgument(distribution.getNumberOfFields() ==
pKeys.getNumberOfKeyFields(), "The number of key fields in the distribution and
range partitioner should be the same.");
-
Preconditions.checkArgument(Arrays.equals(distribution.getKeyTypes(),
pKeys.getKeyFieldTypes()), "The types of key from the distribution and range
partitioner are not equal.");
+
Preconditions.checkArgument(pKeys.getNumberOfKeyFields() <=
distribution.getNumberOfFields(), "The number of key fields in range
partitioner should be less than the number in the distribution.");
+
Preconditions.checkArgument(Arrays.equals(pKeys.getKeyFieldTypes(),
Arrays.copyOfRange(distribution.getKeyTypes(), 0,
pKeys.getNumberOfKeyFields())), "The type array of the partition key should be
prefix of the type array of the distribution.");
--- End diff --
Please split this line and update the message to "The types of the flat key
fields must be a equal of the types of the fields of the distribution."
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