/*
 *  call-seq:
 *     query_parser.tokenized_fields = fields -> self
 *
 *  Set the list of tokenized_fields. These tokenized_fields are tokenized in
 *  the queries. If this is set to Qnil then all fields will be tokenized. 
 */
static VALUE
frt_qp_set_tkz_fields(VALUE self, VALUE rfields)
{
    GET_QP;
    if (qp->tokenized_fields) hs_destroy(qp->tokenized_fields);
    qp->tokenized_fields = frt_get_fields(rfields);
    return self;
}