dennishuo commented on code in PR #2223:
URL: https://github.com/apache/polaris/pull/2223#discussion_r2377906571


##########
runtime/service/src/main/java/org/apache/polaris/service/admin/PolarisAdminService.java:
##########
@@ -1686,14 +1691,33 @@ public boolean grantPrivilegeOnNamespaceToRole(
         PolarisAuthorizableOperation.ADD_NAMESPACE_GRANT_TO_CATALOG_ROLE;
     authorizeGrantOnNamespaceOperationOrThrow(op, catalogName, namespace, 
catalogRoleName);
 
+    CatalogEntity catalogEntity =
+        findCatalogByName(catalogName)
+            .orElseThrow(() -> new NotFoundException("Parent catalog %s not 
found", catalogName));
     PolarisEntity catalogRoleEntity =
         findCatalogRoleByName(catalogName, catalogRoleName)
             .orElseThrow(() -> new NotFoundException("CatalogRole %s not 
found", catalogRoleName));
 
     PolarisResolvedPathWrapper resolvedPathWrapper = 
resolutionManifest.getResolvedPath(namespace);
     if (resolvedPathWrapper == null
         || !resolvedPathWrapper.isFullyResolvedNamespace(catalogName, 
namespace)) {
-      throw new NotFoundException("Namespace %s not found", namespace);
+      boolean rbacForFederatedCatalogsEnabled =
+          getCurrentPolarisContext()
+              .getRealmConfig()
+              
.getConfig(FeatureConfiguration.ENABLE_SUB_CATALOG_RBAC_FOR_FEDERATED_CATALOGS);
+      if (resolutionManifest.getIsPassthroughFacade() && 
rbacForFederatedCatalogsEnabled) {
+        resolvedPathWrapper =
+            createSyntheticNamespaceEntities(catalogEntity, namespace, 
resolvedPathWrapper);

Review Comment:
   Yeah that definitely seems reasonable. We might want a way to convey 
allowing a service owner to force a realm-level setting (at least if the 
service owner wants to force *not* JIT-creating entities because they don't 
want to use up lots of database storage), but generally it seems convenient to 
be able to allow per-catalog settings.
   
   That matches what I imagined as well, which would be that per-catalog owners 
may eventually choose to even *update* the passthrough or caching or 
preemptive-sync/migration settings over the lifetime of a catalog, maybe 
starting with keeping things as fully "implicit/passthrough" as much as 
possible then enabling JIT-creation once they decide they want more advanced 
caching/migration features.



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