jianzhenwu commented on issue #5736:
URL: 
https://github.com/apache/incubator-gluten/issues/5736#issuecomment-3713524505

   hi @marin-ma  We meet this issue again. I printed out the buffers for the 
shuffle writer and reader. 
   The data written by RssPartitionWriter is 
   ```
   E20260106 12:07:02.147404 3830552 RssPartitionWriter.cc:110] 
[ShuffleWriteDump] partition=0, size=144
   E20260106 12:07:02.147465 3830552 RssPartitionWriter.cc:112] 
[ShuffleWriteDump] HEX:   28 b5 2f fd 00 48 3d 04 00 e4 06 60 00 00 00 04 00 90 
a4 eb c9 70 03
   ``` 
   
   The data read in by ShuffleReader is 
   ```
   E20260106 12:11:19.396942 3970403 Utils.h:426] input_len=6865, 
compressed_size=6865, compressed_pos=0
   E20260106 12:11:19.397058 3970403 Utils.h:429] output_len=1048576
   E20260106 12:11:19.397078 3970403 Utils.h:438] input[0..63]: 5a 53 54 44 42 
6c 6f 63 6b 10 90 00 00 00 90 00 00 00 62 47 d1 7d 28 b5 2f fd 00 48 3d 04 00 
e4 06 60 00 00 00 04 00 90 a4 eb c9 70 03
   ```
   I noticed that it added `5a 53 54 44 42 6c 6f 63 6b` (which means ZSTDBlock) 
to the beginning of the data. 
   
   
   
   


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