rdblue commented on code in PR #13879:
URL: https://github.com/apache/iceberg/pull/13879#discussion_r2294433132


##########
open-api/rest-catalog-open-api.yaml:
##########
@@ -3260,25 +3260,25 @@ components:
           additionalProperties:
             type: string
 
-    FineGrainedDataProtectionRules:
+    ReadRestrictions:
       type: object
       description: >
-        Fine-grained data protection rules for a table as result of fine 
grained policy evaluation at the catalog end based on the clients access rights.
-        
-        The client SHOULD use these rules to enforce fine-grained data 
protection like column and row level access when reading data from the table.
+          Read Restrictions for a table including projection and row filter 
expressions.
+          The client MUST enforce these rules to read data from the table.
       properties:
-        projections:
+        required-projection:
           description: >
-            This field contains a list of columns or column transforms to be 
projected.
+            A list of projections that must be applied before query 
projections. If the term is a transform, it must replace the column referenced 
by the term.
+            Readers are not allowed to project columns that are not listed and 
must apply transforms.

Review Comment:
   I agree that we need to keep working on the description here to make it 
simpler and more clear. It is weird that the transformed term must replace the 
column it transforms. I think there must be a simpler way to say this, but I 
think right now we at least understand what we are trying to say more 
succinctly.



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