脏数据导致任务失败

0. 使用的是rdbmsReader 2 mysqlWriter
1. rdbmsReader 通过querySql来取数据
2.执行过程中，**遇到脏数据**，突然报下面错误：
列配置信息有错误. 因为您配置的任务中，源头读取字段数:4 与 目的表要写入的字段数:53 不相等. 请检查您的配置并作出修改.
**表中已经成功插入部分数据**
这样的情况该怎么处理？

The issue names no files or tests; start by tracing the rdbmsReader querySql path and mysqlWriter handling. Reproduce the dirty-data case while checking the source and target column counts and partial inserts. Done means the cause of the 4-versus-53 mismatch and the behavior of already inserted rows are explained and covered by a regression test.

Written by the indexing model from the issue text.