+
+ dstobj = createZsetObject();
+ dstzset = dstobj->ptr;
+
+ if (op == REDIS_OP_INTER) {
+ /* sort sets from the smallest to largest, this will improve our
+ * algorithm's performance */
+ qsort(src,zsetnum,sizeof(zsetopsrc), qsortCompareZsetopsrcByCardinality);
+
+ /* skip going over all entries if the smallest zset is NULL or empty */
+ if (src[0].dict && dictSize(src[0].dict) > 0) {
+ /* precondition: as src[0].dict is non-empty and the zsets are ordered
+ * from small to large, all src[i > 0].dict are non-empty too */
+ di = dictGetIterator(src[0].dict);
+ while((de = dictNext(di)) != NULL) {
+ double *score = zmalloc(sizeof(double));
+ *score = 0.0;
+
+ for (j = 0; j < zsetnum; j++) {
+ dictEntry *other = (j == 0) ? de : dictFind(src[j].dict,dictGetEntryKey(de));
+ if (other) {
+ *score = *score + src[j].weight * (*(double*)dictGetEntryVal(other));
+ } else {
+ break;
+ }
+ }
+
+ /* skip entry when not present in every source dict */
+ if (j != zsetnum) {
+ zfree(score);
+ } else {
+ robj *o = dictGetEntryKey(de);
+ dictAdd(dstzset->dict,o,score);
+ incrRefCount(o); /* added to dictionary */
+ zslInsert(dstzset->zsl,*score,o);
+ incrRefCount(o); /* added to skiplist */
+ }
+ }
+ dictReleaseIterator(di);
+ }
+ } else if (op == REDIS_OP_UNION) {
+ for (i = 0; i < zsetnum; i++) {
+ if (!src[i].dict) continue;
+
+ di = dictGetIterator(src[i].dict);
+ while((de = dictNext(di)) != NULL) {
+ /* skip key when already processed */
+ if (dictFind(dstzset->dict,dictGetEntryKey(de)) != NULL) continue;
+
+ double *score = zmalloc(sizeof(double));
+ *score = 0.0;
+ for (j = 0; j < zsetnum; j++) {
+ if (!src[j].dict) continue;
+
+ dictEntry *other = (i == j) ? de : dictFind(src[j].dict,dictGetEntryKey(de));
+ if (other) {
+ *score = *score + src[j].weight * (*(double*)dictGetEntryVal(other));
+ }
+ }
+
+ robj *o = dictGetEntryKey(de);
+ dictAdd(dstzset->dict,o,score);
+ incrRefCount(o); /* added to dictionary */
+ zslInsert(dstzset->zsl,*score,o);
+ incrRefCount(o); /* added to skiplist */
+ }
+ dictReleaseIterator(di);
+ }
+ } else {
+ /* unknown operator */
+ redisAssert(op == REDIS_OP_INTER || op == REDIS_OP_UNION);
+ }
+
+ deleteKey(c->db,dstkey);
+ dictAdd(c->db->dict,dstkey,dstobj);
+ incrRefCount(dstkey);
+
+ addReplyLong(c, dstzset->zsl->length);
+ server.dirty++;
+ zfree(src);
+}
+
+static void zunionCommand(redisClient *c) {
+ zunionInterGenericCommand(c,c->argv[1], REDIS_OP_UNION);
+}
+
+static void zinterCommand(redisClient *c) {
+ zunionInterGenericCommand(c,c->argv[1], REDIS_OP_INTER);
projects / redis.git / blobdiff