AntoinePrv commented on PR #47573:
URL: https://github.com/apache/arrow/pull/47573#issuecomment-3398204626

   - The dispatch once and `uint16_t` implementation were removed as they 
turned out to be slower.
   - Added an unpack implementation for `uint8_t` and `uint16_t` that call the 
`uint32_t` version on a local buffer combined with a `static_cast` loop (what 
was done on the call site before).
   - The performances should remain on par with previous implementations. The 
PR as it is now mainly changes the interface of unpack functions for future 
iterations and cleaner use.


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