code: protected void execute(ExqlContext context, ExprResolver exprResolver) throws Exception {
  
          // 转换语句内容
          unit.fill(context, exprResolver);
  
  
          // 输出日志
          if (logger.isDebugEnabled()) {
              String flushOut = context.flushOut();
              String args = Arrays.toString(context.getArgs());
              logger.debug("EXQL pattern executing:\n    origin: " + pattern + "\n    result: "
                      + flushOut + "\n    params: " + args);
          }
  
      }
docs: 执行转换