kgabryje opened a new pull request #15120:
URL: https://github.com/apache/superset/pull/15120


   ### SUMMARY
   This PR introduces an optimization in running queries for native filters 
data. Currently when user opens a dashboard, we run queries for every native 
filter, regardless if it's hidden in the "Filters out of scope" panel or not. 
This PR defers running filter queries until the filter is visible.
   There are 2 scenarios:
   1. Initially we run queries only for the filters in scope. When user 
uncollapses "Filters out of scope" panel, we run queries for all the filters 
that haven't been loaded yet.
   2. Initially we run queries only for the filters in scope. When user 
switches a tab, causing more filters to be in scope, we run queries only for 
the filters which have just become visible.
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   Please notice how many `data` requests there are in Network panel
   
   Before:
   
https://user-images.githubusercontent.com/15073128/121710250-b64ac700-cad9-11eb-9ed0-df768225989f.mov
   
   After:
   Scenario 1:
   
https://user-images.githubusercontent.com/15073128/121710332-ccf11e00-cad9-11eb-80f2-7bf6f4bb0dbe.mov
   
   Scenario 2:
   
https://user-images.githubusercontent.com/15073128/121710470-f01bcd80-cad9-11eb-8b8f-1104b18fc611.mov
   
   ### TESTING INSTRUCTIONS
   0. Set `DASHBOARD_NATIVE_FILTERS` feature flag to True
   1. Create a dashboard with tabs
   2. Add a few native filters, so that some are initially in scope and some 
out of scope.
   3. Verify that we run queries only for filters in scope, until you open 
"Filters out of scope" panel or navigate to a tab that has charts in scope of 
other filters.
   
   ### 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
   
   CC: @junlincc @villebro 


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