jiayuasu opened a new issue, #3201:
URL: https://github.com/apache/sedona/issues/3201
### Problem
Geography `ST_Envelope` fails on empty inputs:
```sql
SELECT ST_AsText(
ST_Envelope(ST_GeogFromWKT('POINT EMPTY', 4326), false)
);
```
The function asks S2 for a rectangular bound before handling the empty
value, which can expose invalid/NaN sentinel coordinates and throw.
### Expected behavior
- Return the empty input Geography unchanged, matching Sedona's existing
Geometry `ST_Envelope` behavior for typed empty values.
- Preserve the input type and SRID.
- Behave the same for both values of `splitAtAntiMeridian`.
- Continue returning `NULL` for a SQL `NULL` input.
This was discovered while reviewing the coincident-line envelope behavior in
the Geography `ST_MakeLine` pull request.
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