yutannihilation opened a new pull request, #544:
URL: https://github.com/apache/sedona-db/pull/544
As `Proj::transform()` already transforms 4D, the implementation is fairly
simple.
I guess the hard part is to find proper test cases...
```
> SELECT ST_Transform(ST_GeomFromWKT('POINT Z (-124 45 100)'), 4979, 4978);
┌─────────────────────────────────────────────────────────────────────────────────────┐
│ st_transform(st_geomfromwkt(Utf8("POINT Z (-124 45
100)")),Int64(4979),Int64(4978)) │
│ geometry
│
╞═════════════════════════════════════════════════════════════════════════════════════╡
│ POINT Z(-2526244.3011458996 -3745311.197806657 4487419.119544039)
│
└─────────────────────────────────────────────────────────────────────────────────────┘
```
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