jesspav opened a new pull request, #38:
URL: https://github.com/apache/sedona-db/pull/38
## Summary
Adding `ST_CRS` so that we can pull the full CRS object from geometry where
SRIDs do not apply (for example with non-EPSG codes).
Issue: #29
## Examples
```
> select ST_crs(ST_SetCrs(ST_GeomFromText('POINT (1 1)'), 'EPSG:4329')) as
crs;
┌───────────┐
│ crs │
│ utf8 │
╞═══════════╡
│ EPSG:4329 │
└───────────┘
> select ST_crs(ST_SetCrs(ST_GeomFromText('POINT (1 1)'), 'EPSG:4326')) as
crs;
┌───────────┐
│ crs │
│ utf8 │
╞═══════════╡
│ OGC:CRS84 │
└───────────┘
> select ST_crs(ST_SetSrid(ST_GeomFromText('POINT (1 1)'), null)) as crs;
┌──────┐
│ crs │
│ utf8 │
╞══════╡
│ │
└──────┘
```
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