[Feature] 是否支持Oracle19c的整库同步？

### Search before asking

- [x] I had searched in the [issues](https://github.com/apache/incubator-doris/issues?q=is%3Aissue) and found no similar issues.

### Description

我这边从Oracle19c同步到doris时候一直报错
org.apache.flink.client.program.ProgramInvocationException: The main method caused an error: No tables to be synchronized

### Use case

_No response_

### Related issues

_No response_

### Are you willing to submit PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [x] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)

Start by reproducing the Oracle 19c-to-Doris synchronization failure and tracing the Flink connector path that reports “No tables to be synchronized.” Clarify the scope of whole-database synchronization and define done in terms of which Oracle 19c tables are discovered and synchronized.

Written by the indexing model from the issue text.