docs: public Optional<ShardingEncryptor> getShardingEncryptor(final String logicTableName, final String columnName) {
          for (ShardingEncryptorStrategy each : shardingEncryptorStrategies.values()) {
              Optional<ShardingEncryptor> result = each.getShardingEncryptor(logicTableName, columnName);
              if (result.isPresent()) {
                  return result;
              }
          }
          return Optional.absent();
      }