Function zdiff

app/redis-6.2.6/src/t_zset.c:2540–2552

}

static void zdiff(zsetopsrc *src, long setnum, zset *dstzset, size_t *maxelelen, size_t *totelelen) {
    /* Skip everything if the smallest input is empty. */
    if (zuiLength(&src[0]) > 0) {
        int diff_algo = zsetChooseDiffAlgorithm(src, setnum);
        if (diff_algo == 1) {
            zdiffAlgorithm1(src, setnum, dstzset, maxelelen, totelelen);
        } else if (diff_algo == 2) {
            zdiffAlgorithm2(src, setnum, dstzset, maxelelen, totelelen);
        } else if (diff_algo != 0) {
            serverPanic("Unknown algorithm");
        }
    }
}

uint64_t dictSdsHash(const void *key);
int dictSdsKeyCompare(void *privdata, const void *key1, const void *key2);