strongduanmu opened a new issue, #28750:
URL: https://github.com/apache/shardingsphere/issues/28750
## Feature Request
### Is your feature request related to a problem?
No.
### Describe the feature you would like.
Currently, sql federation includes following modules. Core is mainly
responsible for optimization and execution of the federated query engine.
Considering that other modules will depend on the optimization module in the
future, it is necessary to separate the optimization and execution in the core
module.
```
|── sql-federation
├── api
├── core
├── distsql
```
The split module structure is as follows:
```
|── sql-federation
├── api
├── core
├── executor
├── optimizer
```
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