SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function plus (children 1)
     ExpressionList (children 2)
      Function now (children 1)
       ExpressionList
      Function CAST (children 1)
       ExpressionList (children 2)
        Function toFixedString (children 1)
         ExpressionList (children 2)
          Function materialize (children 1)
           ExpressionList (children 1)
            Function toNullable (children 1)
             ExpressionList (children 1)
              Literal \'1\'
          Literal UInt64_1
        Literal \'IPv6\'
