RussellSpitzer commented on code in PR #17783:
URL: https://github.com/apache/iceberg/pull/17783#discussion_r4057696536


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format/spec.md:
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@@ -1416,6 +1417,8 @@ The rows in the delete file must be sorted by `file_path` 
then `pos` to optimize
 
 Equality delete files identify deleted rows in a collection of data files by 
one or more column values, and may optionally contain additional columns of the 
deleted row.
 
+Equality delete files must not be added to v4 tables. Equality deletes cannot 
be added as an entry to a v4 manifest. Equality delete files referenced by v2 
or v3 delete manifests must still be applied in a v4 table. Moving entries 
covered by an equality delete to a v4 manifest requires applying the deletes 
and writing a new data file entry.

Review Comment:
   If we have to add something here, and I don't think we do since there is no 
valid way to write a new equality delete entry via the spec, maybe 
   
   "An equality delete entry cannot be moved into a V4 Manifest, it must either 
be converted or resolved"



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