Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1255#discussion_r46558726
--- Diff: flink-java/src/main/java/org/apache/flink/api/java/DataSet.java
---
@@ -1246,7 +1246,46 @@ public long count() throws Exception {
final TypeInformation<K> keyType =
TypeExtractor.getKeySelectorTypes(keyExtractor, getType());
return new PartitionOperator<T>(this, PartitionMethod.HASH, new
Keys.SelectorFunctionKeys<T, K>(clean(keyExtractor), this.getType(), keyType),
Utils.getCallLocationName());
}
-
+
+ /**
+ * Range-partitions a DataSet on the specified key fields.
+ * <p>
+ * <b>Important:</b>This operation shuffles the whole DataSet over the
network and can take significant amount of time.
--- End diff --
We should add that range partitioning requires an additional pass over the
data to obtain the distribution.
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