kainoa21 opened a new pull request #10981:
URL: https://github.com/apache/arrow/pull/10981


   Adds support for passing Field types for the key and item when creating 
MapType data types.  
   This also enforces that the key field is non-nullable per the spec 
(https://github.com/apache/arrow/blob/master/format/Schema.fbs#L118) 


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