villebro commented on a change in pull request #17470:
URL: https://github.com/apache/superset/pull/17470#discussion_r751957706
##########
File path: superset/db_engine_specs/presto.py
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@@ -872,7 +872,7 @@ def expand_data( # pylint: disable=too-many-locals
values = row.get(name) or []
if isinstance(values, str):
row[name] = values = cast(List[Any],
destringify(values))
- for value, col in zip(values, expanded):
+ for value, col in zip(values or [], expanded):
Review comment:
As the destringified `values` may be `None`, we should probably also
update line 874 to more accurately reflect the expected return value:
```python
row[name] = values = cast(Optional[List[Any]], destringify(values))
```
With this change mypy would see that `values` may be `None`. Alternatively
we may want to move the `or []` up one line, but in this case the return value
will change (not sure which is better).
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