code: public Integer getAssistedQueryColumnCount(final String logicTableName) {
          for (ShardingEncryptorStrategy each : shardingEncryptorStrategies.values()) {
              int result = each.getAssistedQueryColumnCount(logicTableName);
              if (result > 0) {
                  return result;
              }
          }
          return 0;
      }
docs: Get assisted query column count.
  
  @param logicTableName logic table name
  @return assisted query column count