mkzung commented on PR #50475:
URL: https://github.com/apache/arrow/pull/50475#issuecomment-5029457220

   Friendly ping on this one. The workflow runs look like they're still waiting 
on
   approval, so none of the C++ or Python jobs have actually executed here yet.
   
   @jorisvandenbossche you diagnosed this back in 2023 and suggested letting it 
pick
   AdaptiveIntBuilder vs AdaptiveUIntBuilder depending on the signedness of the 
original
   index type, so you may want to see why I didn't go that way. It changes 
which class
   MakeDictionaryBuilder returns, and util/converter.h, json/from_string.cc and 
the R
   binding all cast that result to DictionaryBuilder<T>.
   TestDictionaryUnifier.ChunkedArrayNestedDict trips a checked_pointer_cast 
DCHECK
   straight away. This keeps one builder class instead and preserves the 
requested
   signedness where the index type is reported.
   
   Happy to rebase if it's gone stale.
   


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