SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function CAST (children 1)
     ExpressionList (children 2)
      Literal UInt64_1
      Literal \'Enum8(\\\'hello\\\' = 1, \\\'world\\\' = 2)\'