RussellSpitzer commented on code in PR #17198:
URL: https://github.com/apache/iceberg/pull/17198#discussion_r3798832519
##########
format/spec.md:
##########
@@ -674,11 +674,13 @@ A manifest file must store the partition spec and other
metadata as properties i
| _optional_ | _required_ | `format-version` | Table format version
number of the manifest as a string
|
| | _required_ | `content` | Type of content files
tracked by the manifest: "data" or "deletes"
|
-The schema of a manifest file is defined by the `manifest_entry` struct,
described in the following section.
+#### Content file uniqueness
+
+Within a snapshot, each content file must be referenced by at most one
manifest entry across all manifests; otherwise, the snapshot has undefined
behavior. Writers are not required to validate uniqueness at commit time.
Review Comment:
I guess that's true. We can add Should, although technically we haven't
defined what "added and updated" in the same file means, at least in a CDC
context. It's up to implementations to decide whether that's modeled as rows
being added and removed for never having existed. But i'll change the wording
to say should.
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