rdblue commented on code in PR #10981:
URL: https://github.com/apache/iceberg/pull/10981#discussion_r1907662104
##########
format/spec.md:
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@@ -205,13 +205,18 @@ Supported primitive types are defined in the table below.
Primitive types added
| | **`uuid`** | Universally unique identifiers
| Should use 16-byte fixed
|
| | **`fixed(L)`** | Fixed-length byte array of length L
|
|
| | **`binary`** | Arbitrary-length byte array
|
|
+| [v3](#version-3) | **`geometry(C)`** | Geometry features from [OGC – Simple
feature access](https://portal.ogc.org/files/?artifact_id=25355). Edges
interpolation is always linear/planar. See [Appendix
G](#appendix-g-geospatial-notes). Parameterized by crs C [4]. If not specified,
C is `OGC:CRS84`. | |
+| [v3](#version-3) | **`geography(C, A)`** | Geometry features from [OGC –
Simple feature access](https://portal.ogc.org/files/?artifact_id=25355). See
[Appendix G](#appendix-g-geospatial-notes). Parameterized by crs C[5] and
edge-interpolation algoritm A [6]. If not specified, C is `OGC:CRS84`. |
|
+
Notes:
1. Timestamp values _without time zone_ represent a date and time of day
regardless of zone: the time value is independent of zone adjustments
(`2017-11-16 17:10:34` is always retrieved as `2017-11-16 17:10:34`).
2. Timestamp values _with time zone_ represent a point in time: values are
stored as UTC and do not retain a source time zone (`2017-11-16 17:10:34 PST`
is stored/retrieved as `2017-11-17 01:10:34 UTC` and these values are
considered identical).
3. Character strings must be stored as UTF-8 encoded byte arrays.
-
+4. CRS (coordinate reference system) is a mapping of how coordinates refer to
locations on Earth. See [Appendix G](#appendix-g-geospatial-notes) for
specifying custom CRS. If this field is null (no custom crs provided), CRS
defaults to `OGC:CRS84`, which means the data must be stored in longitude,
latitude based on the WGS84 datum. Fixed and cannot be changed by schema
evolution.
Review Comment:
The text about schema evolution should be in the evolution section rather
than here.
The default value is already in the table so it doesn't need to be in the
note.
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