mapleFU commented on issue #37559:
URL: https://github.com/apache/arrow/issues/37559#issuecomment-1706416781

   When it goes to rep-def levels, I believe we already have some BMI2 impls: 
   
   
https://github.com/apache/arrow/blob/a526ba697d4e3f009731bebda6838b41899051e3/cpp/src/parquet/level_conversion.cc#L128
   
   However, other decode part missing this. 


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