Support CF.MEXISTS command (#2951)

* Support CF.MEXISTS command

* Minor: code review

Co-authored-by: M Sazzadul Hoque <7600764+sazzad16@users.noreply.github.com>

* Minor: code review

Co-authored-by: M Sazzadul Hoque <7600764+sazzad16@users.noreply.github.com>

* Minor: remove empty sequence checks

Co-authored-by: M Sazzadul Hoque <7600764+sazzad16@users.noreply.github.com>

src/main/java/redis/clients/jedis/CommandObjects.java

@@ -3567,6 +3567,11 @@ public final CommandObject<Boolean> cfExists(String key, String item) {
     return new CommandObject<>(commandArguments(CuckooFilterCommand.EXISTS).key(key).add(item), BuilderFactory.BOOLEAN);
   }
 
+  public final CommandObject<List<Boolean>> cfMExists(String key, String... items) {
+    return new CommandObject<>(commandArguments(CuckooFilterCommand.MEXISTS).key(key)
+        .addObjects((Object[]) items), BuilderFactory.BOOLEAN_LIST);
+  }
+
   public final CommandObject<Boolean> cfDel(String key, String item) {
     return new CommandObject<>(commandArguments(CuckooFilterCommand.DEL).key(key).add(item), BuilderFactory.BOOLEAN);
   }

src/main/java/redis/clients/jedis/UnifiedJedis.java

@@ -3975,6 +3975,11 @@ public boolean cfExists(String key, String item) {
     return executeCommand(commandObjects.cfExists(key, item));
   }
 
+  @Override
+  public List<Boolean> cfMExists(String key, String... items) {
+    return executeCommand(commandObjects.cfMExists(key, items));
+  }
+
   @Override
   public boolean cfDel(String key, String item) {
     return executeCommand(commandObjects.cfDel(key, item));

src/main/java/redis/clients/jedis/bloom/CuckooFilterCommands.java

@@ -108,6 +108,16 @@ public interface CuckooFilterCommands {
    */
   boolean cfExists(String key, String item);
 
+  /**
+   * {@code CF.MEXISTS {key} {item ...}}
+   *
+   * @param key   The name of the filter
+   * @param items Items to check for (non empty sequence)
+   * @return a list of booleans where false if the item certainly does not exist,
+   *         true if the item may exist.
+   */
+  List<Boolean> cfMExists(String key, String... items);
+
   /**
    * CF.DEL Deletes an item once from the filter. If the item exists only once, it
    * will be removed from the filter. If the item was added multiple times, it

src/main/java/redis/clients/jedis/bloom/RedisBloomProtocol.java

@@ -36,6 +36,7 @@ public enum CuckooFilterCommand implements ProtocolCommand {
     INSERT("CF.INSERT"), //
     INSERTNX("CF.INSERTNX"), //
     EXISTS("CF.EXISTS"), //
+    MEXISTS("CF.MEXISTS"), //
     DEL("CF.DEL"), //
     COUNT("CF.COUNT"), //
     SCANDUMP("CF.SCANDUMP"), //

src/test/java/redis/clients/jedis/modules/bloom/BloomTest.java

@@ -215,4 +215,9 @@ public void insertExpansion() {
         "o", "i", "u", "y", "t", "r", "e", "w", "q");
     assertEquals(20, insert.size());
   }
+
+  @Test(expected = JedisDataException.class)
+  public void testNoItemMExists() {
+    client.bfMExists("simpleBloom");
+  }
 }

src/test/java/redis/clients/jedis/modules/bloom/CuckooTest.java

@@ -7,6 +7,7 @@
 import static org.junit.Assert.fail;
 
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.Map;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
@@ -180,12 +181,25 @@ public void testInsertNxNoCreate() {
   @Test
   public void testExistsItemDoesntExist() {
     assertFalse(client.cfExists("cuckoo16", "foo"));
+    assertEquals(Collections.singletonList(false), client.cfMExists("cuckoo16", "foo"));
   }
 
   @Test
   public void testExistsItemExists() {
     client.cfInsert("cuckoo17", "foo");
     assertTrue(client.cfExists("cuckoo17", "foo"));
+    assertEquals(Collections.singletonList(true), client.cfMExists("cuckoo17", "foo"));
+  }
+
+  @Test(expected = JedisDataException.class)
+  public void testNoItemMExists() {
+    client.cfMExists("cuckoo17");
+  }
+
+  @Test
+  public void testMixedItemsMExists() {
+    client.cfInsert("cuckoo18", "foo");
+    assertEquals(Arrays.asList(true, false), client.cfMExists("cuckoo18", "foo", "bar"));
   }
 
   @Test