[Question]请问现在是不支持多表join采集吗

### Search before asking

- [ ] I had searched in the [issues](https://github.com/DTStack/chunjun/issues) and found no similar question.

- [ ] I had googled my question but i didn't get any help.

- [ ] I had read the documentation: [ChunJun doc](https://dtstack.github.io/chunjun) but it didn't help me.

### Description

我配置输入表：T_USER_V1表，T_LOG_V1表，输出表：T_PROCESS_V1；使用T_LOG_V1关联T_USER_V1后，向T_PROCESS_V1保存数据。
但是在com.dtstack.chunjun.connector.jdbc.converter.JdbcSqlConverter#toInternal中进行结果只处理时，toInternalConverters只有T_LOG_V1的，没有T_USER_V1，导致在处理T_USER_V1结果值时报错

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