mybatis-plus groupby

MyBatis-Plus is an enhanced version of MyBatis, a popular Java persistence framework. It provides additional features and utilities to simplify database access and SQL operations. However, MyBatis-Plus does not directly support the GROUP BY clause in SQL.

To perform a GROUP BY query using MyBatis-Plus, you can use the `@SqlParser(filter = true)` annotation on your mapper interface method, and then manually write the SQL statement with the GROUP BY clause. Here's an example:

@Mapper
public interface YourMapper extends BaseMapper<YourEntity> {
    @SqlParser(filter = true) // This annotation is needed to bypass MyBatis-Plus parsing
    @Select("SELECT column1, column2, COUNT(*) as count FROM your_table GROUP BY column1, column2")
    List<Map<String, Object>> groupByColumns();
}

In this example, `YourEntity` represents your entity class, and `your_table` is the corresponding database table. The `groupByColumns` method returns a list of maps, where each map represents a row of the result set.

Remember to adjust the SQL statement based on your specific use case and table structure.