nonbinaryprogrammer commented on a change in pull request #7236:
URL: https://github.com/apache/geode/pull/7236#discussion_r780466710
##########
File path:
geode-for-redis/src/main/java/org/apache/geode/redis/internal/data/RedisSet.java
##########
@@ -110,6 +111,42 @@ private static MemberSet calculateDiff(RegionProvider
regionProvider, List<Redis
return diff;
}
+ public static Set<byte[]> sinter(RegionProvider regionProvider,
List<RedisKey> keys) {
+ List<RedisSet> sets = new ArrayList<>(keys.size());
+ RedisSet smallestSet = NULL_REDIS_SET;
+
+ for (RedisKey key : keys) {
+ RedisSet redisSet = regionProvider.getTypedRedisData(REDIS_SET, key,
true);
+ if (redisSet == NULL_REDIS_SET) {
+ return Collections.emptySet();
+ }
+ if (smallestSet == NULL_REDIS_SET) {
+ smallestSet = redisSet;
+ }
+ if (smallestSet.scard() > redisSet.scard()) {
+ sets.add(smallestSet);
+ smallestSet = redisSet;
+ } else {
+ sets.add(redisSet);
+ }
+ }
+
+ MemberSet result = new MemberSet(smallestSet.scard());
+ for (byte[] member : smallestSet.members) {
+ boolean addToSet = true;
+ for (RedisSet otherSet : sets) {
+ if (!otherSet.members.contains(member)) {
+ addToSet = false;
+ break;
+ }
+ }
+ if (addToSet) {
+ result.add(member);
+ }
Review comment:
not a big deal, but this can be simplified to
```
for(RedisSet otherSet : sets) {
if(otherSet.members.contains(member)) {
result.add(member);
} else {
break;
}
}
```
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