ajantha-bhat commented on code in PR #8982:
URL: https://github.com/apache/iceberg/pull/8982#discussion_r1686001845


##########
format/spec.md:
##########
@@ -1370,3 +1370,16 @@ Writing v2 metadata:
     * `sort_columns` was removed
 
 Note that these requirements apply when writing data to a v2 table. Tables 
that are upgraded from v1 may contain metadata that does not follow these 
requirements. Implementations should remain backward-compatible with v1 
metadata requirements.
+
+## Appendix F: Implementation Notes

Review Comment:
   Just wondering why can't we mandate this in spec? because it is optional 
field? We can use "if exists" while mandating in the spec?
   
   Also, we have implementation suggetions like  "File System Tables" and 
"Metastore tables" in the spec. So, can we have a "Time Travel" section for 
this?



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