Remove import module in moose_lib and implemente null engine in tables_to_python in generate.rs

Author: admin

apps/framework-cli/src/framework/python/generate.rs

@@ -781,9 +781,7 @@ pub fn tables_to_python(tables: &[Table], life_cycle: Option<LifeCycle>) -> Stri
                 writeln!(output, "    engine=MergeTreeEngine(),").unwrap();
             }
             crate::infrastructure::olap::clickhouse::queries::ClickhouseEngine::Null => {
-                // No explicit engine for Null in moose_lib,
-                // so we do not generate an `engine=...` parameter in OlapConfig.
-                // (If you want a real Null ENGINE later, we can adapt here.)
+                writeln!(output, "    engine=NullEngine(),").unwrap();
             }
 
             crate::infrastructure::olap::clickhouse::queries::ClickhouseEngine::ReplacingMergeTree { ver, is_deleted } => {

packages/py-moose-lib/moose_lib/internal.py

@@ -7,7 +7,6 @@
 JSON format expected by the Moose infrastructure management system.
 """
 import json
-from importlib import import_module
 from typing import TYPE_CHECKING, Any, Dict, List, Literal, Optional, Union
 
 from pydantic import AliasGenerator, BaseModel, ConfigDict, Field