if (end >= llen) end = llen-1;
rangelen = (end-start)+1;
- /* Return the result in form of a multi-bulk reply */
+ /* check if starting point is trivial, before searching
+ * the element in log(N) time */
if (reverse) {
- ln = zslGetElementByRank(zsl, llen - start);
+ ln = start == 0 ? zsl->tail : zslGetElementByRank(zsl, llen - start);
} else {
- ln = zslGetElementByRank(zsl, start + 1);
+ ln = start == 0 ? zsl->header->forward[0] : zslGetElementByRank(zsl, start + 1);
}
+ /* Return the result in form of a multi-bulk reply */
addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",
withscores ? (rangelen*2) : rangelen));
for (j = 0; j < rangelen; j++) {