strongduanmu opened a new issue, #23133:
URL: https://github.com/apache/shardingsphere/issues/23133
## Feature Request
### Is your feature request related to a problem?
No.
### Describe the feature you would like.
Currently, the DataSourceContainedRule#getDataSourceMapper interface is
declared as follows. The result is a `Map<String, Collection<String>>`
structure, which is not easy to use. For example: I want to get the primary
data source from this Map.
```java
/**
* ShardingSphere rule which contains data source.
*/
public interface DataSourceContainedRule extends ShardingSphereRule {
/**
* Get data source mapper.
*
* @return data source mapper
*/
Map<String, Collection<String>> getDataSourceMapper();
}
```
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