rkrishn7 commented on issue #14380:
URL: https://github.com/apache/datafusion/issues/14380#issuecomment-2644143759

   +1 on moving `ExpandWildcardRule`!
   
   > We might need to perform union coercion twice: once in the builder, and 
once in TypeCoercion(after coercion of exprs).
   
   Hmm, my immediate thought here is that if we cannot guarantee correctly 
coerced inputs during the first pass, then it's probably not worth attempting 
to coerce in the builder at all. But, I could be missing something!


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