sp-202 commented on code in PR #4423:
URL: https://github.com/apache/datafusion-comet/pull/4423#discussion_r3299708868
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docs/geo-functions.md:
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@@ -0,0 +1,583 @@
+# Comet Geo Functions
+
+Comet provides 40 geospatial SQL functions registered as Spark SQL extensions.
+All functions execute natively in the Rust/DataFusion engine when Comet is
enabled
+(`spark.comet.exec.enabled=true`). Geometries are represented as WKT strings.
+
+## Constructors
+
+Functions that create geometry values.
+
+### st_geomfromwkt
+
+```sql
+st_geomfromwkt(wkt STRING) -> STRING
+```
+
+Parses a WKT string and returns the geometry. Returns `null` if the input is
`null`.
+
+```sql
+SELECT st_geomfromwkt('POINT(1.0 2.0)');
+-- POINT (1 2)
+```
Review Comment:
@paleolimbot — thanks, really helpful direction!
1. Is sedona-extension on crates.io or would it be a git dependency?
2. Which arrow-rs version does SedonaDB pin? Comet is on 58.3.0 they need to
match.
3. Direct Cargo dep or the C ABI path you mentioned — which do you prefer?
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