* The prototype of topN sql worker.
* Add scope and new manual dispatcher.
* no message
* Finish topN persistence codes. Not test yet. And query have not added.
* Finish the top n database statement persistent.
* Support different slow thresholds for different db types.
* Fix wrong db default threshold
* Finish new query protocol binding.
* Provide query empty implementation and sync ui.
* Finish all codes, hope it works :P
I will run the tests tonight.
* Fix
* Fix
* Fix a startup issue.
* Add time bucket to persistent.
* Fix wrong query result column name.
* Fix Database query.
* Fix checkstyle.
* Fix wrong order logic, and add a test case to verify, to fix https://github.com/apache/incubator-skywalking/pull/2239#discussion_r255948249
2. Make service relation and endpoint relation to record component id.
3. Delete service mapping indicator.
4. Make service inventory to record mapping service id.
5. Refactor global topology query and service topology query.
* Add generate indicator and dispatcher about service topology but not test.
* Delete call type from service relation.
* Streaming analysis topology test success.
* Fixed the check style error.