SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 3)
    Identifier x
    Identifier s
    Identifier z
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function VALUES (children 1)
       ExpressionList (children 3)
        Literal \'x UInt64, s String, z ALIAS concat(toString(x), \\\': \\\', s)\'
        Literal Tuple_(UInt64_1, \'hello\')
        Literal Tuple_(UInt64_2, \'world\')