trxcllnt commented on PR #40408:
URL: https://github.com/apache/arrow/pull/40408#issuecomment-1984245844

   IIRC the Map keys are required to be strings (tho I'm not sure we prevent 
someone from using a different type). Or has newer Arrow has loosened this 
requirement? That's the only reason I can think we'd have made the assumption 
the keys would always be strings here.


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