szehon-ho commented on code in PR #10981:
URL: https://github.com/apache/iceberg/pull/10981#discussion_r1755705776


##########
format/spec.md:
##########
@@ -190,6 +190,7 @@ 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, T, E)`** | An object of the simple feature 
geometry model as defined by Appendix G; This may be any of the Geometry 
subclasses defined therein; coordinate reference system C [4], coordinate 
reference system type T [5], edges E [6] | C, T, E are fixed. Encoded as WKB, 
see Appendix G.   |

Review Comment:
   Related to above comment, I think these will all be optional (take a default 
value if not specified).



##########
format/spec.md:
##########
@@ -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.
+5. Coordinate Reference System Type, value specifying type of Coordinate 
Reference System field, if that is different from default. Defaults to empty 
string. Fixed and cannot be changed by schema evolution.
+6. Edges, interpretation for edges within geometry object, i.e. whether the 
edge between points represent a straight cartesian line or the shortest line on 
the sphere. Please note that it only applies to polygons. Fixed and cannot be 
changed by schema evolution.

Review Comment:
   Done, thanks.



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