Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/15609
  
    Then, wouldn't the responsibility of type coercion be your own layer? I 
guess this PR virtually mean every expression handled in `TypeCoercion` should 
be fixed too. For example, I guess 
    
    ```scala
    Greatest(Seq(Literal(10, IntegerType), Literal("a", StringType))).eval()
    ```
    
    wouldn't work too.


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