yordan-pavlov edited a comment on pull request #325:
URL: https://github.com/apache/arrow-rs/pull/325#issuecomment-845370004


   @kornholi thank you for looking into `BitReader` and `DeltaBitPackDecoder`; 
these performance improvements will combine very well with the change I have 
been working on here https://github.com/apache/arrow-rs/issues/200; similar to 
you, I have also found the current implementation of the parquet reader to be 
fairly inefficient in some places where for example it's unnecessarily creating 
clones of `ByteBufferPtr`, or allocating `Vec`s, etc. I can't wait to see what 
the combined performance improvements will be. 


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