Jefffrey commented on PR #23190:
URL: https://github.com/apache/datafusion/pull/23190#issuecomment-4807189756

   i dont think we should base support only on sql type mapping; for example 
this could be called via dataframe api, or if sql has arrow_cast, etc.
   
   `count` does support it via the generic catchall, but i think its just an 
oversight that decimal32/decimal64 dont have specialized paths since they were 
types added later (compared to decimal128/decimal256)
   
   
https://github.com/apache/datafusion/blob/ff677c4a8b6bc098d00fba05a817619b08031809/datafusion/functions-aggregate/src/count.rs#L262-L266


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