yutannihilation commented on PR #183:
URL: https://github.com/apache/sedona-db/pull/183#issuecomment-3371850823
During adding these tests, I found PostGIS raise errors for these two cases
where my implementation returns `NULL`.
The first one is two `NULL`s. I think test should not fail with this error
because `NULL::geometry` works. However, casting to geometry doesn't work on
SedonaDB yet.
```
postgres=# SELECT ST_Azimuth(NULL, NULL);
ERROR: function st_azimuth(unknown, unknown) is not unique
LINE 1: SELECT ST_Azimuth(NULL, NULL);
^
HINT: Could not choose a best candidate function. You might need to add
explicit type casts.
```
The second one is empty point. I thought this returns `NULL` without errors,
but it seems PostGIS doesn't allow empty point. I think we can follow this
behavior.
```
postgres=# SELECT ST_Azimuth(ST_Point(0, 0), ST_GeomFromText('POINT EMPTY'));
NOTICE: lwgeom_api.c [351] called with n=0 and npoints=0
ERROR: Error extracting point
```
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