betodealmeida opened a new pull request #19055:
URL: https://github.com/apache/superset/pull/19055


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   ### SUMMARY
   <!--- Describe the change below, including rationale and design decisions -->
   
   This PR introduces 2 helper functions for RLS:
   
   - `has_table_query(statement: Statement) -> bool:`, which analyzes a SQL 
statement parsed by`sqlparse` and returns `True` if it queries a table (either 
in a `FROM` or `JOIN`).
   - `insert_rls(token_list: TokenList, table: str, rls: TokenList) -> 
TokenList:`, which given a parsed statement (or token list), a table name, and 
a parsed RLS expression, will reformat the query so that the RLS is present in 
any queries or subqueries referencing the table.
   
   For example, if we have the RLS expression `id=42` on the table `my_table` 
we could do:
   
   ```python
   >>> statement = sqlparse.parse('SELECT COUNT(*) FROM my_table')[0]
   >>> has_table_query(statement)
   True
   >>> rls = sqlparse.parse('id=42')[0]
   >>> print(insert_rls(statement, 'my_table', rls)
   SELECT COUNT(*) FROM my_table WHERE id=42
   ```
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   <!--- Skip this if not applicable -->
   
   N/A
   
   ### TESTING INSTRUCTIONS
   <!--- Required! What steps can be taken to manually verify the changes? -->
   
   I added unit tests covering different cases.
   
   ### 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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