Kontinuation commented on issue #1427:
URL: https://github.com/apache/sedona/issues/1427#issuecomment-2129114447
The expression `ST_IsEmpty(NULL)` will evaluate to `NULL`. Since SQL uses
three-valued logic, where TRUE, FALSE, and NULL are distinct values, you may
need to use the following query to find NULL or empty geometries:
```python
df.where("geometry IS NULL OR ST_IsEmpty(geometry)").count()
```
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