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 materialize (children 1)
       ExpressionList (children 1)
        Function toDate32 (children 1)
         ExpressionList (children 2)
          Literal \'2015-08-19\'
          Literal \'UTC\'
      Literal \'UTC\'
