sha174n opened a new pull request, #38357:
URL: https://github.com/apache/superset/pull/38357

   <!---
   Please write the PR title following the conventions at 
https://www.conventionalcommits.org/en/v1.0.0/
   Example:
   fix(dashboard): load charts correctly
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   ### SUMMARY
   <!--- Describe the change below, including rationale and design decisions -->
   This PR enhances the reliability and performance of Row Level Security (RLS) 
management by standardizing the command lifecycle and upgrading the SQL parsing 
engine for filter clauses.
   
   Key Changes:
   * Refined SQL Parsing: Implemented a recursive AST walker within the SQL 
parsing utility. This ensures that unsupported SQL patterns (such as nested 
subqueries) are reliably identified across complex expressions, improving 
parsing accuracy.
   * Management Layer Standardization: Refactored CreateRLSRuleCommand and 
UpdateRLSRuleCommand to utilize modern BaseCommand and DAO patterns. Validation 
logic has been centralized into a dedicated helper (validate_rls_clause) to 
ensure consistency across the management API.
   * Performance Optimization: Relocated filter validation from the runtime 
query generation path (models.py) to the management layer. By validating 
clauses only at creation or update time, we eliminate redundant parsing 
overhead from the critical path of dashboard execution.
   * Enhanced API Feedback: Improved REST API error handling to provide 
granular feedback. When unsupported SQL fragments are detected, the API now 
returns clear, actionable 422 errors instead of generic system failures.
   
   ### 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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