AliIbnBotir opened a new pull request, #45263:
URL: https://github.com/apache/superset/pull/45263
### SUMMARY
`flatten` post-processing reset only the first level of the dataframe index
(`df.reset_index(level=0)`). After a `pivot` with two or more index columns,
the
remaining index levels were never turned back into columns, so they were lost
when the result was serialized. `flatten` now resets every index level. A
single-level index behaves as before.
### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
N/A (backend only)
### TESTING INSTRUCTIONS
- `pytest tests/unit_tests/pandas_postprocessing/test_flatten.py`
- New test `test_flat_should_reset_every_index_level` pivots on two index
columns and checks that both come back as columns after `flatten`.
### ADDITIONAL INFORMATION
- [x] Has associated issue: Fixes #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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