villebro opened a new pull request, #21035:
URL: https://github.com/apache/superset/pull/21035

   ### SUMMARY
   Add query cancellation functionality to Trino spec as outlined here: 
https://trino.io/docs/current/connector/system.html#system-connector-procedures.
 Since we're now extending the Presto spec which handles query cancellation 
implicitly, but the Trino driver doesn't, we also need to return `False` on 
`has_implicit_cancel`.
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   Previously, cancelling a query on Trino would leave the query running on the 
database. However, after this change, when cancelling a query, the query will 
terminate with the following error:
   
![image](https://user-images.githubusercontent.com/33317356/183861967-988467c2-0d4d-4829-a4b2-546e5b876182.png)
   
   On the Trino UI we can see the following:
   
![image](https://user-images.githubusercontent.com/33317356/183862020-ee313469-4766-4f32-aaa8-2ec27dc112bd.png)
   
   ### TESTING INSTRUCTIONS
   1. Run a long running query on Trino
   2. Cancel the query
   3. Verify that the query terminates
   
   ### ADDITIONAL INFORMATION
   <!--- Check any relevant boxes with "x" -->
   <!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
   - [ ] Has associated issue:
   - [ ] Required feature flags:
   - [ ] Changes UI
   - [ ] Includes DB Migration (follow approval process in 
[SIP-59](https://github.com/apache/superset/issues/13351))
     - [ ] Migration is atomic, supports rollback & is backwards-compatible
     - [ ] Confirm DB migration upgrade and downgrade tested
     - [ ] Runtime estimates and downtime expectations provided
   - [ ] Introduces new feature or API
   - [ ] Removes existing feature or API
   


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