mkzung opened a new issue, #50695:
URL: https://github.com/apache/arrow/issues/50695

   Follow-up to #50475, suggested in review there: an unsigned dictionary index 
type keeps its signedness, but the width still adapts on the signed thresholds 
because the dictionary builder reuses the signed AdaptiveIntBuilder internally. 
A uint8 index widens to uint16 after 128 distinct values instead of 256, so one 
bit of the range is unused.
   


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