alamb commented on issue #15161:
URL: https://github.com/apache/datafusion/issues/15161#issuecomment-2722603481

   > I checked and found that Spark has the same behavior as PostgreSQL. Maybe 
we should use a different coercion rule for this since the current 
[`comparison_coercion`](https://github.com/apache/datafusion/blob/bb1611578f8af42aacf611cb580940964665702d/datafusion/expr-common/src/type_coercion/binary.rs#L710)
 is also used by `union`.
   
   I agree we should split the coercion rules for union and binary comparison
   
   


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