jiangjiguang commented on code in PR #20830:
URL: https://github.com/apache/flink/pull/20830#discussion_r1004038649


##########
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:
   @luoyuxia Good idea. I have added comments.  Besides, I have connected 
parquet-mr community to suggest remote the deprecated flag and change to use 
byte array default.



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