Fix RBAC tests on >=26.1

Author: CarlosFelipeOR

rbac/helper/errors.py

@@ -110,6 +110,17 @@ def cannot_insert_row_policy(name):
 
 
 def cannot_update_default(self):
+    if check_clickhouse_version("<23.8")(self):
+        message = "Exception: Cannot update user `default` in users.xml because this storage is readonly"
+    else:
+        message = "Exception: Cannot update user `default` in users_xml because this storage is readonly"
+
+    return (
+        cannot_remove_default_exitcode,
+        message,
+    )
+
+def cannot_set_default_role_for_default_user(self):
     if check_clickhouse_version(">=26.2")(self):
         # PR #88139 changed storage initialization order, causing SET_NON_GRANTED_ROLE (512)
         # PR #96841 fixed exit codes to return 255 for server errors

rbac/tests/privileges/create/create_table.py

@@ -1093,11 +1093,17 @@ def create_as_another_table(self, node=None):
                             )
 
                         with And(
-                            "grant SHOW TABLES privilege on source table to the user"
+                            "grant SHOW TABLES/COLUMNS privilege on source table to the user"
                         ):
-                            node.query(
-                                f"GRANT SHOW TABLES ON {source_table_name} TO {user_name}"
-                            )
+                            # PR #94556: CREATE TABLE ... AS now requires SHOW COLUMNS instead of SHOW TABLES
+                            if check_clickhouse_version(">=26.1")(self):
+                                node.query(
+                                    f"GRANT SHOW COLUMNS ON {source_table_name} TO {user_name}"
+                                )
+                            else:
+                                node.query(
+                                    f"GRANT SHOW TABLES ON {source_table_name} TO {user_name}"
+                                )
                             node.query(
                                 f"CREATE TABLE {table_name} AS {source_table_name}",
                                 settings=[("user", f"{user_name}")],

rbac/tests/syntax/set_default_role.py

@@ -115,7 +115,7 @@ def setup(users=2, roles=2):
             requirements=[RQ_SRS_006_RBAC_SetDefaultRole("1.0")],
         ):
             with When("I set a default role for default"):
-                exitcode, message = errors.cannot_update_default(self)
+                exitcode, message = errors.cannot_set_default_role_for_default_user(self)
                 node.query(
                     "SET DEFAULT ROLE role0 TO default",
                     exitcode=exitcode,