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 toDate32 (children 1)
         ExpressionList (children 2)
          Literal \'2015-08-18\'
          Literal \'UTC\'
      Function toDateTime (children 1)
       ExpressionList (children 2)
        Literal \'2015-08-19 00:00:00\'
        Literal \'UTC\'
      Literal \'UTC\'