bit2swaz commented on PR #10431:
URL: https://github.com/apache/arrow-rs/pull/10431#issuecomment-5090645245

   right, thanks for bringing that up. i can see that #9772 made these `pub` on 
purpose for @ashdnazg's cross-thread use case in #9771 so this PR as is reverts 
that
   
   i think both goals can coexist tho. the only soundness relevant fields are 
`release` and `private_data` since those are what `Drop` calls. the plain data 
fields being `pub` is harmless. and the thing #9771 actually needs, wrapping 
`release` + `private_data` with your own, is an `unsafe` operation anyway since 
youre taking over memory ownership
   
   one direction i think would suit this would be to make the fields private 
and give back that one capability through a small `unsafe` API in the same 
spirit as `from_raw`. exact shape depends on how @ashdnazg actually uses it
   
   @ashdnazg do you mutate the struct in place (swap `release` + `private_data` 
on an existing one) or do you take it apart and rebuild with your own release? 
and do you need the originals read back out? that would decide whether this 
wants an unsafe swap method or an unsafe "from parts" constructor. happy to 
build whichever fits :)
   


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