lilykuang opened a new pull request #19242:
URL: https://github.com/apache/superset/pull/19242


   <!---
   Please write the PR title following the conventions at 
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   fix(dashboard): load charts correctly
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   ### SUMMARY
   <!--- Describe the change below, including rationale and design decisions -->
   RLS only works for basic case. The chart/data api allows several controls 
(ad-hoc metrics, ad-hoc filters) where users can write any SQL in these fields, 
including subqueries. Any subqueries, or nested subqueries, do not currently 
have RLS rules applied to them and thus can leak data users shouldn’t have 
access to.
   
   This PR allows most of ad-hoc sql but reject adhoc contains subqueries or 
nested subqueries.  It is using helper #19055. The feature flag 
`ALLOW_ADHOC_SUBQUERY` is set to True by default to maintain the current 
workflow. 
   We will have a follow up implementation to add RLS rules to subqueries and 
nested subqueries. 
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   <!--- Skip this if not applicable -->
   
   ### TESTING INSTRUCTIONS
   <!--- Required! What steps can be taken to manually verify the changes? -->
   
   ### 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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