paleolimbot commented on code in PR #8222:
URL: https://github.com/apache/arrow-rs/pull/8222#discussion_r2299625911
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arrow-schema/src/extension/canonical/geometry.rs:
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@@ -0,0 +1,136 @@
+use crate::extension::ExtensionType;
+use crate::ArrowError;
+
+/// Geospatial features in the WKB format with linear/planar edges
interpolation
+#[derive(Debug, Default, Clone, PartialEq, Eq, Hash)]
+pub struct Geometry {
+ crs: Option<String>,
Review Comment:
From the Parquet end, the CRS is never absent (or: if omitted, we know it's
lon/lat). From the GeoArrow end, an omitted CRS means "the producer does not
know", the verbage of which comes from GeoParquet and basically follows what a
CRS of `None` is in GeoPandas. All to say that I think this part is correct
(but you're right that it's annoying to handle for everybody).
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