FrancescoCastaldi commented on issue #45261:
URL: https://github.com/apache/superset/issues/45261#issuecomment-6524025516
### Root Cause Analysis & Solution
In `superset/utils/pandas_postprocessing/flatten.py`, the index reset was
implemented as:
```python
if reset_index and not isinstance(df.index, pd.RangeIndex):
df = df.reset_index(level=0)
```
When a pivot operation uses multiple index columns (e.g. pivoting on two or
more row dimensions), the result has a multi-level index. Calling
`reset_index(level=0)` only converts the first level into a regular column,
leaving all subsequent levels trapped in the index. When serialized to records
or JSON, the untransformed index levels are lost.
#### Solution
Remove `level=0` to reset all index levels into columns:
```python
if reset_index and not isinstance(df.index, pd.RangeIndex):
df = df.reset_index()
```
Verified with unit tests in
`tests/unit_tests/pandas_postprocessing/test_flatten.py` and committed to
branch `fix/community-unanswered-issues` (commit `2de5ed61ce1`) at
https://github.com/FrancescoCastaldi/superset/tree/fix/community-unanswered-issues.
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