serenajiang opened a new pull request #8097: [fix] add checks for stopped 
queries
URL: https://github.com/apache/incubator-superset/pull/8097
 
 
   ### CATEGORY
   
   Choose one
   
   - [X] Bug Fix
   - [ ] Enhancement (new features, refinement)
   - [ ] Refactor
   - [ ] Add tests
   - [ ] Build / Development Environment
   - [ ] Documentation
   
   ### SUMMARY
   When a user tries to stop a query, very occasionally, the action fails and 
the query still runs to completion. The issue isn't user-facing, but errors in 
the backend show that there is some kind of lock wait timeout issue.
   
   Unknown if it is possible to completely prevent these, and the issue isn't 
really user-facing, but I added some tweaks to hopefully prevent a few of these 
conflicts.
   * Add `commit()` after setting the initial query status to `RUNNING`
   * Check if the query has stopped before running each statement. Exit if 
query has stopped.
   * (Unrelated) Removed line 281 which (afaik) doesn't do anything
   
   ### TEST PLAN
   
   Tox passes.
   
   I didn't write a test because it is pretty hard to reproduce this error - 
seems like a rare timing thing. These changes are mostly for safety and 
shouldn't affect behavior of anything.
   
   ### REVIEWERS
   @etr2460 

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