stevenzwu commented on code in PR #13879:
URL: https://github.com/apache/iceberg/pull/13879#discussion_r3221754198


##########
open-api/rest-catalog-open-api.yaml:
##########
@@ -3480,6 +3480,309 @@ components:
           additionalProperties:
             type: string
 
+    ReadRestrictions:
+      type: object
+      description: >
+          Read restrictions for a table, including column projections and row 
filter expressions.
+
+          A client MUST enforce the restrictions defined in this object when 
reading data
+          from the table.
+
+          These restrictions apply only to the authenticated principal, user, 
or account
+          associated with the request. They MUST NOT be interpreted as global 
policy and
+          MUST NOT be applied beyond the entity identified by the 
Authentication header
+          (or other applicable authentication mechanism).
+
+          If both properties are absent or empty, the ReadRestrictions object 
imposes no
+          restrictions and is equivalent to the field being absent from the 
response.
+          A server MUST NOT return an action for a column whose type is not 
listed in
+          that action's "Applicable to" set.
+          For all actions, if the input column value is NULL, the output MUST 
be NULL.

Review Comment:
   ok. maybe I missed the agreement in the previous discussion. I thought these 
two actions may not need to preserve the null.



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