stevenzwu commented on code in PR #15630:
URL: https://github.com/apache/iceberg/pull/15630#discussion_r3120210405


##########
format/spec.md:
##########
@@ -1637,6 +1686,30 @@ The binary single-value serialization can be used to 
store the lower and upper b
 
 ## Appendix E: Format version changes
 
+### Version 4
+
+Relative path support is added in v4.
+
+Reading v3 metadata for v4:
+
+* All location fields are treated as absolute paths
+* Any location field without a uri scheme prefix must prepend a scheme 
component consistent with v4

Review Comment:
   But it contradict with earlier sentences in this spec change. We said before 
V4 all file paths are absolute paths and absolute path is defined as including 
URI scheme.
   ```
    **Absolute path** -- A path string that includes a 
[URI](https://datatracker.ietf.org/doc/html/rfc3986#section-3.1) scheme and can 
be used directly.
   ...
   Prior to v4, all path fields must contain absolute paths. 
   ```
   



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