desruisseaux commented on code in PR #10981:
URL: https://github.com/apache/iceberg/pull/10981#discussion_r1806236061
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format/spec.md:
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@@ -198,6 +199,9 @@ Notes:
- 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).
- 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`).
3. Character strings must be stored as UTF-8 encoded byte arrays.
+4. Coordinate Reference System, i.e. mapping of how coordinates refer to
precise locations on earth. Defaults to "OGC:CRS84". Fixed and cannot be
changed by schema evolution.
Review Comment:
Note that this example is non-standard. A CRS JSON encoding is in progress
at OGC, but we don't know yet what it will look like. The only standards at
this time are GML, WKT, or simply put a reference to the EPSG database or OGC
registry (e.g. https://www.opengis.net/def/crs/OGC/0/CRS84 or
`"urn:ogc:def:crs:OGC::CRS84"`).
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