mapleFU commented on PR #55408:
URL: https://github.com/apache/arrow/pull/55408#issuecomment-6737474859

   > Member
   Does this even make a difference in a benchmark? There are so many expensive 
things happening when reading or writing Parquet (such as compression or 
encoding) that I doubt the cost of std::count is important...
   
   Generally speaking, no. Some optimization might benifit from same 
optimization in https://github.com/apache/arrow/pull/55308 , write side 
previously counting the numbers toooo slow. It has only a few optimization 
during read =_=


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