lazear commented on issue #5490:
URL: https://github.com/apache/arrow-rs/issues/5490#issuecomment-2006047407

   OK, so I did some profiling... the biggest culprit appears to be farther 
down in my stack (gzip compression of the streaming newline-delimited JSON...), 
which delays returning any responses until the stream is finished - which in 
the case of filters being applied, requires the entire file to be parsed first.


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