ritchie46 commented on issue #4764:
URL: https://github.com/apache/arrow-rs/issues/4764#issuecomment-1704387454

   > Really cool to see this happening.
   
   Gotta start somewhere. :)
   
   > It also has a tendency to result in poor test iteration times as different 
crates set different sets of features forcing recompilation.
   
   This should not hurt your test times as I will ensure the default features 
remain the same. This will only make it possible for end-users as polars to 
cherry pick some stuff. For testing we use `cargo hack` to test every feature 
gate (not all combinations). But I don't think it's needed here as I don't plan 
to mess with the defaults.
   
   > is there a particular crate that is showing up as a bottleneck during 
compilation?
   
   The compile times in polars are already way longer than we want. That's why 
I'd like to cherry pick on functionality. For the `parquet` crate I was looking 
add feature gating the IPC readers and `take` kernels out. Again this should 
not have any impact on the arrow-rs defaults/ repo and consumers.


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