/*
 *  call-seq:
 *     query_parser.fields -> Array of Symbols
 *
 *  Returns the list of all fields that the QueryParser knows about.
 */
static VALUE
frt_qp_get_fields(VALUE self)
{
    GET_QP;
    int i;
    HashSet *fields = qp->all_fields;
    VALUE rfields = rb_ary_new();

    for (i = 0; i < fields->size; i++) {
        rb_ary_push(rfields, ID2SYM(rb_intern((char *)fields->elems[i])));
    } 

    return rfields;
}