code: public SqlInfo end() {
          SqlInfo sqlInfo = this.source.getSqlInfo();
          sqlInfo.setSql(StringHelper.replaceBlank(sqlInfo.getJoin().toString()));
          SqlInfoPrinter.newInstance().printZealotSqlInfo(sqlInfo, false, null, null);
          return sqlInfo;
      }
docs: 结束SQL拼接流程，并生成最终的sqlInfo信息.
  @return sqlInfo