SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function VALUES (children 1)
       ExpressionList (children 3)
        Literal \'x UInt8, y UInt16\'
        Function plus (children 1)
         ExpressionList (children 2)
          Literal UInt64_1
          Literal UInt64_2
        Literal \'Hello\'