RaigorJiang opened a new issue #11013:
URL: https://github.com/apache/shardingsphere/issues/11013
## Bug Report
### Which version of ShardingSphere did you use?
ShardingSphere-Proxy 5.0.0-beta
### Expected behavior
Use distSQL, add a resource:
```sql
ADD RESOURCE resource_0 (
HOST=127.0.0.1,
PORT=3306,
DB=db0,
USER=root,
PASSWORD=root
);
```
and then drop the resource immediately (did not config any other rule):
```sql
DROP RESOURCE resource_0
```
Expect the `resource_0` was deleted.
### Actual behavior
Got error:
` Error Code: 1101. Resources [resource_0] in the rule are still in used.`
### Reason analyze
After the resource added, proxy refresh `ShardingRule` at the backend.
`resource_0` may be relted to a `SingleTableRule` in class
`SingleTableRuleLoader`.
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