tustvold opened a new issue, #2530:
URL: https://github.com/apache/arrow-rs/issues/2530

   **Is your feature request related to a problem or challenge? Please describe 
what you are trying to do.**
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frustrated when [...] 
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   `SerializedFileReader` and friends currently perform a lot of copying of 
`RowGroupMetadata` and `FileMetadata`, whilst reading indexes and filtering row 
groups. Neither of these are small or particularly cheap to clone.
   
   **Describe the solution you'd like**
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   I would like to reduce the amount of unnecessary work being performed, 
either by altering the interfaces so data can be moved instead of cloned, or 
using Arc 
   
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