* Typo fix in CONTRIBUTING.md
* Alter references to config.get('FOO') to use preferred config['FOO']
* Set missing configuration constants in superset/config.py
* Misc. CI fixes
* Add type annotation for FEATURE_FLATGS
* Create query_obj for every filter
* Deprecate is_prequery and prequeries from query_obj
* Fix tests
* Fix typos and remove redundant ; from sql
* Add typing to namedtuples and move all query str logic to one place
* Fix unit test
- Unify the metric interface (absorb the current plain string metric for built-in metric keys into the format used by adhoc metric)
- Port the logic in adhocMetric on the client and process_metrics in the backend to the new typed Metrics class
- Omit hasCustomLabel and formFromData properties from the new metric interface as their value can be inferred from label and optionName
- Expose from the Metrics class both metrics and their labels as public methods to match the all_metrics and metric_labels fields in the backend code
- Provide defaut values for filters, metrics and groupby in the backend
* [SIP-5] Open a new /api/v1/query endpoint that takes query_obj
- Introduce a new handle_superset_exception decorator to avoid repeating the logic for catching SupersetExceptions
- Create a query_obj_backfill method that takes form_data and constructs a query_obj that will be constructed in the client in the future. Use the backfill in explore_json.
- Create a new /api/v1/query endpoint that takes query_obj only and returns the payload data. Note the query_obj is constructed in the client. The endpoint currently only handles query_obj for table view viz (we'll be adding support to new viz types as we go).
- Unit test to verify the new endpoint for table view
* fix tests and lint errors
* - Move the new query endpoint into its own api.py view.
- Create QueryObject and QueryContext class to encapsulate query_object to be built from the client and additional info (e.g. datasource) needed to get the data payload for a given query
- Remove the query_obj_backfill as we'll start building the first query_object on the client so it no longer makes sense to have a short-lived backfill for the matter of days.
* Fixing lint and test errors
* Fixing additional lint error from the previous rebase.
* fixing additional lint error
* addressing additional pr comments
* Make /query accept a list of queries in the query_context object.
* fixing a lint error
* - Move time_shift based calculation and since, until check into util
- Add typing info for get_since_until
- Add new unit tests to verify time_shift calculation and the since until check
