SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function age (children 1)
     ExpressionList (children 4)
      Literal \'day\'
      Function materialize (children 1)
       ExpressionList (children 1)
        Function toDateTime (children 1)
         ExpressionList (children 2)
          Literal \'2015-08-18 00:00:00\'
          Literal \'UTC\'
      Function toDate32 (children 1)
       ExpressionList (children 2)
        Literal \'2015-08-19\'
        Literal \'UTC\'
      Literal \'UTC\'
