Github user kevinjmh commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/2732#discussion_r218635891
--- Diff: core/src/main/java/net/jpountz/lz4/LZ4CompressorWithLength.java
---
@@ -0,0 +1,225 @@
+/*
+ * 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.
+ */
+
+// code ported from https://github.com/lz4/lz4-java/issues/119
+// remove this class when new version > 1.4.1 released
+// this is only for test
+
+/*
+ * Licensed 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 net.jpountz.lz4;
+
+import java.nio.ByteBuffer;
+import java.util.Arrays;
+
+/**
+ * Covenience class to include the length of the original decompressed data
+ * in the output compressed data, so that the user does not need to save
+ * the length at anywhere else. The compressed data must be decompressed
by
+ * {@link LZ4DecompressorWithLength} and is NOT compatible with any other
+ * decompressors in lz4-java or any other lz4 tools. This class
deliberately
+ * does not extend {@link LZ4Compressor} because they are not
interchangable.
+ */
+
+public class LZ4CompressorWithLength {
--- End diff --
yes. These codes didn't not packed in a released jar. Here we cope it only
for test. See comment in L18-20
---
