TableWithRef_ds.queryBuildDataSource().addGroupByField(fieldNum(TableWithRef, Worker));
DirPerson_ds.queryBuildDataSource().addGroupByField(fieldNum(DirPerson, Name));
TableWithRef_ds.queryBuildDataSource().addGroupByField(fieldNum(TableWithRef, Worker));
DirPerson_ds.queryBuildDataSource().addGroupByField(fieldNum(DirPerson, Name));