Add Unset code for ST_SetSrid

[jesspav]

Summary

After this change, using code 0 in ST_SetSrid unsets the CRS.

Changes

Updated the UDF to check for the 0 code.

Testing

• Added unit test
• Added an integration test
• Added additional integration tests for ST_SetSrid

Example

> select ST_SetSrid(ST_GeomFromText('POINT (1 1)'), 4326)
;
┌─────────────────────────────────────────────────────────────┐
│ st_setsrid(st_geomfromwkt(Utf8("POINT (1 1)")),Int64(4326)) │
│                       wkb <ogc:crs84>                       │
╞═════════════════════════════════════════════════════════════╡
│ POINT(1 1)                                                  │
└─────────────────────────────────────────────────────────────┘

1 row(s)/1 column(s) fetched. 
Elapsed 0.024 seconds.

> select ST_SetSrid(ST_SetSrid(ST_GeomFromText('POINT (1 1)'), 4326), 0);
┌──────────────────────────────────────────────────────────────────────────────────┐
│ st_setsrid(st_setsrid(st_geomfromwkt(Utf8("POINT (1 1)")),Int64(4326)),Int64(0)) │
│                                        wkb                                       │
╞══════════════════════════════════════════════════════════════════════════════════╡
│ POINT(1 1)                                                                       │
└──────────────────────────────────────────────────────────────────────────────────┘

[Copilot]

Pull Request Overview

This PR adds functionality to handle SRID code 0 as a special case in the ST_SetSRID function, where passing 0 will unset the coordinate reference system (CRS) of the geometry. This aligns with PostGIS behavior where SRID 0 indicates no spatial reference system.

• Added logic to treat string "0" as a None CRS value in the ST_SetSRID function
• Added comprehensive test coverage for both integer and string SRID inputs including the new 0 behavior
• Added Python integration tests to verify the functionality works end-to-end

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
rust/sedona-functions/src/st_setsrid.rs	Added conditional logic to handle "0" as unset CRS and unit test for integer 0 input
python/sedonadb/tests/functions/test_transforms.py	Added comprehensive test cases for ST_SetSRID with various SRID inputs including 0

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[paleolimbot]

Thank you!