lidavidm commented on PR #43632:
URL: https://github.com/apache/arrow/pull/43632#issuecomment-2306060082

   > Either remove the extension parameter or change it to be const char* using 
the metadata encoding like we're doing for the on_error callback
   
   I think the metadata encoding is reasonable. I guess it'll force people to 
do a lot of string parsing, but that's just how it goes.
   
   FWIW, do we need to do anything to accommodate the arrow::ArrayStatistics 
API that @kou has been working on?
   
   > Do we want to go ahead with the waker approach?
   
   I'm not quite sold on this if we want to have a callback based API. Though I 
understand wanting to have the most efficient possible theoretical API. At 
least from my Flight/gRPC based view, though, it seems difficult to take 
advantage of.


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