etr2460 opened a new pull request #15786:
URL: https://github.com/apache/superset/pull/15786


   ### SUMMARY
   Back in https://github.com/apache/superset/pull/8901 @villebro made changes 
to include `datasource.changed_on` to the chart cache key so that a change to 
the datasource would bust the chart cache. This was important because a user 
could change the sql for a datasource, but rerunning the chart wouldn't rerun 
the query before.
   
   In this PR it seems like we intended to also bust the cache when 
metrics/columns were changed 
(https://github.com/apache/superset/pull/8901/files#r372541748) but that 
doesn't seem to work. This PR addresses that oversight and adds a test to check 
it
   
   ### TESTING INSTRUCTIONS
   CI, new unit test
   
   create a chart, update a metric, see the chart's cache busted
   
   ### ADDITIONAL INFORMATION
   <!--- Check any relevant boxes with "x" -->
   <!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
   - [ ] Has associated issue:
   - [ ] 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
   
   to: @john-bodley @villebro @dpgaspar 


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