SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function less (children 1)
     ExpressionList (children 2)
      Function toDate (children 1)
       ExpressionList (children 1)
        Literal \'1991-02-01\'
      Function toDate32 (children 1)
       ExpressionList (children 1)
        Literal \'2283-11-11\'