luoyuxia commented on code in PR #20830:
URL: https://github.com/apache/flink/pull/20830#discussion_r1002872635
##########
flink-formats/flink-parquet/src/main/java/org/apache/flink/formats/parquet/vector/reader/RunLengthDecoder.java:
##########
@@ -265,8 +265,16 @@ void readNextGroup() {
while (valueIndex < this.currentCount) {
// values are bit packed 8 at a time, so reading
bitWidth will always work
ByteBuffer buffer = in.slice(bitWidth);
- this.packer.unpack8Values(
- buffer, buffer.position(), this.currentBuffer,
valueIndex);
+ if (buffer.hasArray()) {
+ this.packer.unpack8Values(
Review Comment:
I'm wondering why this changes will improve perfermance. IIUC, from the code
```java
public void unpack8Values(final byte[] input, final int inPos, final int[]
output, final int outPos) {
unpack8Values(ByteBuffer.wrap(input), inPos, output, outPos);
}
```
the method just delegates to `unpack8Values` and it needs extra
`ByteBuffer.wrap(input)`.
Could you please explain a little bit?
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