mgaido91 commented on issue #23308: [SPARK-26308][SQL] Infer abstract decimal 
type for java/scala BigDecimal
URL: https://github.com/apache/spark/pull/23308#issuecomment-447847205
 
 
   >  why can't we do it if we also add a type coercion rule for ScalaUDF?
   
   yes, that would work but we'd have to special case `ScalaUDF` in the 
TypeCohercionRules.. I think the current fix is cleaner. What do you think?

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