HedgehogCode commented on pull request #8949:
URL: https://github.com/apache/arrow/pull/8949#issuecomment-754727763
When I use the changes and try to compress and decompress an empty buffer
(by using a variable sized vector with only missing values) I get a SIGSEGV:
```
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007f1209448fd0, pid=10504, tid=0x00007f1208bc7700
#
# JRE version: OpenJDK Runtime Environment (8.0_275-b01) (build
1.8.0_275-b01)
# Java VM: OpenJDK 64-Bit Server VM (25.275-b01 mixed mode linux-amd64
compressed oops)
# Problematic frame:
# V [libjvm.so+0x6fdfd0] jni_ThrowNew+0xc0
#
# Core dump written. Default location: /workspaces/arrow/java/vector/core or
core.10504
```
This can be reproduced by adding the following test to
`TestCompressionCodec.java`:
```java
@Test
public void testEmptyBuffer() throws Exception {
final int vecLength = 10;
final VarBinaryVector origVec = new VarBinaryVector("vec", allocator);
origVec.allocateNew(vecLength);
// Do not set any values (all missing)
origVec.setValueCount(vecLength);
final List<ArrowBuf> origBuffers = origVec.getFieldBuffers();
final List<ArrowBuf> compressedBuffers = compressBuffers(origBuffers);
final List<ArrowBuf> decompressedBuffers =
deCompressBuffers(compressedBuffers);
// TODO assert that the decompressed buffers are correct
AutoCloseables.close(decompressedBuffers);
}
```
This looks like an error in the lz4-java library but I am not sure. I
thought I should mention it here first.
(Note that I am using OpenJDK 8 and I haven't tried OpenJDK 11 yet)
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