Add intersectSize methods for SINTERCARD operation in RedisSet

Signed-off-by: Kiminni <imk0980@gmail.com>

Author: Kiminni

src/main/java/org/springframework/data/redis/support/collections/DefaultRedisSet.java

@@ -33,6 +33,7 @@
  * @author Costin Leau
  * @author Christoph Strobl
  * @author Mark Paluch
+ * @author Mingi Lee
  */
 public class DefaultRedisSet<E> extends AbstractRedisCollection<E> implements RedisSet<E> {
 
@@ -117,6 +118,16 @@ public RedisSet<E> intersectAndStore(Collection<? extends RedisSet<?>> sets, Str
 		return new DefaultRedisSet<>(boundSetOps.getOperations().boundSetOps(destKey));
 	}
 
+	@Override
+	public Long intersectSize(RedisSet<?> set) {
+		return boundSetOps.intersectSize(set.getKey());
+	}
+
+	@Override
+	public Long intersectSize(Collection<? extends RedisSet<?>> sets) {
+		return boundSetOps.intersectSize(CollectionUtils.extractKeys(sets));
+	}
+
 	@Override
 	public Set<E> union(RedisSet<?> set) {
 		return boundSetOps.union(set.getKey());

src/main/java/org/springframework/data/redis/support/collections/RedisSet.java

@@ -28,6 +28,7 @@
  * @author Costin Leau
  * @author Christoph Strobl
  * @author Mark Paluch
+ * @author Mingi Lee
  */
 public interface RedisSet<E> extends RedisCollection<E>, Set<E> {
 
@@ -122,6 +123,28 @@ static <E> RedisSet<E> create(String key, RedisOperations<String, E> operations)
 	 */
 	RedisSet<E> intersectAndStore(Collection<? extends RedisSet<?>> sets, String destKey);
 
+	/**
+	 * Returns the cardinality of the set which would result from the intersection of this set and another
+	 * {@link RedisSet}.
+	 *
+	 * @param set must not be {@literal null}.
+	 * @return the cardinality of the intersection.
+	 * @see <a href="https://redis.io/commands/sintercard">Redis Documentation: SINTERCARD</a>
+	 * @since 4.0
+	 */
+	Long intersectSize(RedisSet<?> set);
+
+	/**
+	 * Returns the cardinality of the set which would result from the intersection of this set and other
+	 * {@link RedisSet}s.
+	 *
+	 * @param sets must not be {@literal null}.
+	 * @return the cardinality of the intersection.
+	 * @see <a href="https://redis.io/commands/sintercard">Redis Documentation: SINTERCARD</a>
+	 * @since 4.0
+	 */
+	Long intersectSize(Collection<? extends RedisSet<?>> sets);
+
 	/**
 	 * Get random element from the set.
 	 *