Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1255#discussion_r46556636
--- Diff:
flink-core/src/main/java/org/apache/flink/api/common/distributions/SampledDataDistribution.java
---
@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.flink.api.common.distributions;
+
+import org.apache.flink.core.memory.DataInputView;
+import org.apache.flink.core.memory.DataOutputView;
+
+import java.io.IOException;
+
+/**
+ * While range partition automatically, Flink sample the source data, and
assign range index for each record,
+ * so its data distribution is very simple, just return the bucket index
as its boundary.
+ */
+public class SampledDataDistribution implements DataDistribution {
+ @Override
+ public Integer[] getBucketBoundary(int bucketNum, int totalNumBuckets) {
+ return new Integer[] { bucketNum };
+ }
+
+ @Override
+ public int getNumberOfFields() {
+ return -1;
+ }
+
+ @Override
+ public void write(DataOutputView out) throws IOException {
--- End diff --
Is there a need to implement `write()` and `read()`?
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