kou commented on issue #40308:
URL: https://github.com/apache/arrow/issues/40308#issuecomment-1996304983

   > Below codes could prove this problem:
   
   I'm not sure what is the important part in the codes. Could you explain it?
   
   > our Redshift’s decimal promotion rules
   
   Could you show the URL that describes the rule?
   
   > is there any relevant background here?
   
   Based on the `kMinAdjustedScale` comment, it seems that the current 
precision doesn't have strong reason but it's compatible with SQLServer and 
Impala:
   
   
https://github.com/apache/arrow/blob/6b1e254f3b62924f216e06e9e563e92c69f9efd3/cpp/src/gandiva/decimal_type_util.h#L54-L58
   


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