code: private Map<String, Object> paramProcess(Map<String, Object> params) {
          if (params == null || params.size() == 0)
              return null;
          Map<String, Object> newParams = new HashMap<String, Object>(params);
          for (Entry<String, Object> entry : params.entrySet()) {
              String paramName = entry.getKey();
              Object paramObj = entry.getValue();
  
              if (paramObj.getClass().isArray()) {
                  inParamProcess(paramName, paramObj, newParams);
                  newParams.remove(paramName);
              }
  
              if (paramObj instanceof Collection) {
                  Collection<?> collection = (Collection<?>) paramObj;
                  Object[] paramVals = Lang.collection2array(collection);
                  inParamProcess(paramName, paramVals, newParams);
                  newParams.remove(paramName);
              }
  
          }
  
          return newParams;
      }
docs: sql参数处理，在这里处理Array Collection类型参数，方便SQL IN 表达式的设置
  
  @param params
  参数map，无参数时，可为null
  
  @return 包含处理IN表达式的sql