SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function CAST (children 1)
     ExpressionList (children 2)
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'\'
        Literal \'Nullable(FixedString(1))\'
      Literal \'Nullable(Enum8(\\\'Hello\\\' = 1))\'
