StephanEwen commented on pull request #17520:
URL: https://github.com/apache/flink/pull/17520#issuecomment-970256639


   @tsreaper Thanks for doing the benchmark.
   
   I am curious to understand what the difference is between "bulk format + 
array list" and "stream format", because the "stream format" also puts 
deserialized records into an ArrayList. But something must be different, else 
there would not be such a big performance difference.
   
   Can we try and identify that, and maybe update the StreamFormatAdapter to be 
better?


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