code: @Override
      public Set<byte[]> ssKeys(byte[] key) {
          try {
              if (isPipelined()) {
                  pipeline(new JedisResult(pipeline.sskeys(key)));
                  return null;
              }
  
              return this.client.sskeys(key);
          } catch (Exception ex) {
              throw convertException(ex);
          }
      }
docs: /*
  @see RedisSessionOfHashSetCommands#ssKeys(byte[])