presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/metadata/DatabaseMetadataModule.java/DatabaseMetadataModule/createDataSource
class DatabaseMetadataModule:        @ForMetadata
        @Singleton
        @Provides
        DataSource createDataSource(JdbcDatabaseConfig config, @ForMetadata MySqlDataSourceConfig mysqlConfig)
        {
            ServiceDescriptor descriptor = serviceDescriptor("mysql")
                    .addProperty("jdbc", config.getUrl())
                    .build();
            return new MySqlDataSource(new StaticServiceSelector(descriptor), mysqlConfig);
        }