Copilot commented on code in PR #4750:
URL: https://github.com/apache/polaris/pull/4750#discussion_r3408862689


##########
runtime/service/src/test/java/org/apache/polaris/service/catalog/iceberg/AbstractIcebergCatalogHandlerAuthzTest.java:
##########
@@ -1296,6 +1297,17 @@ public void 
testRenameTablePrivilegesOnWrongSourceOrDestination() {
         adminService.grantPrivilegeOnNamespaceToRole(
             CATALOG_NAME, CATALOG_ROLE1, NS2, PolarisPrivilege.TABLE_CREATE));
     newHandler().renameTable(rename2);
+
+    // Verify that renaming a non-existent source reports the source 
identifier in the error
+    TableIdentifier nonExistentSource = TableIdentifier.of(NS1, 
"no_such_table");
+    RenameTableRequest badRename =
+        RenameTableRequest.builder()
+            .withSource(nonExistentSource)
+            .withDestination(dstTable)
+            .build();
+    Assertions.assertThatThrownBy(() -> newHandler().renameTable(badRename))
+        .isInstanceOf(NoSuchTableException.class)
+        .hasMessageContaining(nonExistentSource.toString());

Review Comment:
   This assertion currently depends on `dstTable` not triggering a different 
precondition failure (e.g., destination already exists / destination validation 
order changes). To make the test robust to future changes in validation order, 
use a guaranteed-nonexistent destination identifier (in an existing namespace) 
specifically for this check, so the failure deterministically reflects the 
missing source.



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