jiayuasu opened a new issue, #3200:
URL: https://github.com/apache/sedona/issues/3200
### Problem
An empty Geography LineString does not produce valid WKB. Structural
functions that convert the value to JTS therefore fail:
```sql
SELECT ST_NPoints(ST_GeogFromWKT('LINESTRING EMPTY', 4326));
```
The call throws `RuntimeException: Failed to parse WKB to JTS Geometry`
instead of returning `0`.
### Root cause
`WKBWriter.writePolyline` writes the LineString header but does not write
the required zero coordinate count when `SinglePolylineGeography` has no S2
polyline.
### Expected behavior
- Serialize an empty Geography LineString as valid WKB with a coordinate
count of zero.
- Preserve the SRID.
- Allow WKB-to-JTS and WKB-to-S2 round trips.
- Return `0` from structural accessors such as `ST_NPoints`.
This was discovered while reviewing the Geography overload for `ST_MakeLine`.
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