betodealmeida opened a new pull request #8233: Simplify and improve 
`expand_data` in Presto
URL: https://github.com/apache/incubator-superset/pull/8233
 
 
   ### CATEGORY
   
   Choose one
   
   - [ ] Bug Fix
   - [X] Enhancement (new features, refinement)
   - [ ] Refactor
   - [ ] Add tests
   - [ ] Build / Development Environment
   - [ ] Documentation
   
   ### SUMMARY
   <!--- Describe the change below, including rationale and design decisions -->
   
   This PR simplifies the logic of the `expand_data` method in Presto, while 
making it more generic. Queries that were failing before, like
   
   ```sql
   SELECT ARRAY[ROW(100,0,'hello')]
   ```
   
   are now working.
   
   Some of the methods in `db_engine_specs/presto.py` are no longer used and 
can be removed; I'll do that in a subsequent PR. I wanted to keep this PR 
simple and small because it's blocking an important release.
   
   <!-- ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF -->
   <!--- Skip this if not applicable -->
   
   ### TEST PLAN
   <!--- What steps should be taken to verify the changes -->
   
   I updated the unit tests, and tested with real data. I'll add more unit 
tests in the next PR, covering more complex cases.
   
   ### ADDITIONAL INFORMATION
   <!--- Check any relevant boxes with "x" -->
   <!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
   - [ ] Has associated issue:
   - [ ] Changes UI
   - [ ] Requires DB Migration.
   - [ ] Confirm DB Migration upgrade and downgrade tested.
   - [ ] Introduces new feature or API
   - [ ] Removes existing feature or API
   
   ### REVIEWERS
   
   @khtruong 

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