Dialect: Add methods concerned with isolation levels as no-ops

CHANGES.md

@@ -10,6 +10,7 @@
 - Compiler: Fixed `AttributeError: 'CrateCompilerSA20' object has no attribute
   'visit_on_conflict_do_update'` by forwarding calls to
   `PGCompiler.visit_on_conflict_do_update`
+- Dialect: Added methods concerned with isolation levels as no-ops
 
 ## 2026/05/28 0.42.0
 - Added support for SQL Alchemy 2.1

src/sqlalchemy_cratedb/dialect.py

@@ -218,6 +218,15 @@ def __init__(self, **kwargs):
         # start with _. Adding it here causes sqlalchemy to quote such columns.
         self.identifier_preparer.illegal_initial_characters.add("_")
 
+    def get_isolation_level_values(self, dbapi_conn):
+        return ()
+
+    def set_isolation_level(self, dbapi_connection, level):
+        pass
+
+    def get_isolation_level(self, dbapi_connection):
+        return "AUTOCOMMIT"
+
     def initialize(self, connection):
         # get lowest server version
         self.server_version_info = self._get_server_version_info(connection)

tests/dialect_test.py

@@ -150,3 +150,9 @@ def test_has_schema(self):
             self.executed_statement,
             "select schema_name from information_schema.schemata order by schema_name asc",
         )
+
+    def test_isolation_level(self):
+        self.engine.dialect.set_isolation_level(self.connection, "FOO")
+        assert self.engine.dialect.get_isolation_level(self.connection) == "AUTOCOMMIT"
+        assert self.engine.dialect.get_isolation_level_values(self.connection) == ()
+        self.engine.execution_options(isolation_level="AUTOCOMMIT")