SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function getSizeOfEnumType (children 1)
     ExpressionList (children 1)
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal UInt64_1
        Literal \'Enum8(\\\'a\\\' = 1, \\\'b\\\' = 2)\'
