Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/14349#discussion_r72365970
--- Diff:
sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/VariableLengthRowBasedKeyValueBatch.java
---
@@ -0,0 +1,185 @@
+/*
+ * 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.spark.sql.catalyst.expressions;
+
+import org.apache.spark.memory.TaskMemoryManager;
+import org.apache.spark.sql.types.*;
+import org.apache.spark.unsafe.Platform;
+
+/**
+ * An implementation of `RowBasedKeyValueBatch` in which key-value records
have variable lengths.
+ *
+ * The format for each record looks like this:
+ * [4 bytes total size = (klen + vlen + 4)] [4 bytes key size = klen]
+ * [UnsafeRow for key of length klen] [UnsafeRow for Value of length vlen]
+ * [8 bytes pointer to next]
+ * Thus, record length = 4 + 4 + klen + vlen + 8
+ */
+public final class VariableLengthRowBasedKeyValueBatch extends
RowBasedKeyValueBatch {
--- End diff --
you can write the test suites in scala -- it tends to simplify the code.
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