Fix: Make jinja_macros optional for environment statements

sqlmesh/core/environment.py

@@ -219,7 +219,7 @@ class EnvironmentStatements(PydanticModel):
     before_all: t.List[str]
     after_all: t.List[str]
     python_env: t.Dict[str, Executable]
-    jinja_macros: JinjaMacroRegistry = JinjaMacroRegistry()
+    jinja_macros: t.Optional[JinjaMacroRegistry] = None
 
 
 def execute_environment_statements(

sqlmesh/core/renderer.py

@@ -437,7 +437,7 @@ def render_statements(
                     expression,
                     dialect,
                     [],
-                    jinja_macro_registry=jinja_macros or JinjaMacroRegistry(),
+                    jinja_macro_registry=jinja_macros,
                     python_env=python_env,
                     default_catalog=default_catalog,
                     quote_identifiers=False,

tests/core/test_integration.py

@@ -5268,3 +5268,32 @@ def add_projection_to_model(model: SqlModel, literal: bool = True) -> SqlModel:
         "query": model.query.select(one_expr),  # type: ignore
     }
     return SqlModel.parse_obj(kwargs)
+
+
+def test_plan_environment_statements_doesnt_cause_extra_diff(tmp_path: Path):
+    model_a = """
+    MODEL (
+        name test_schema.a,
+        kind FULL,
+    );
+
+    SELECT 1;
+    """
+
+    models_dir = tmp_path / "models"
+    models_dir.mkdir()
+
+    (models_dir / "a.sql").write_text(model_a)
+
+    config = Config(
+        model_defaults=ModelDefaultsConfig(dialect="duckdb"),
+        before_all=["select 1 as before_all"],
+        after_all=["select 2 as after_all"],
+    )
+    ctx = Context(paths=[tmp_path], config=config)
+
+    # first plan - should apply changes
+    assert ctx.plan(auto_apply=True, no_prompts=True).has_changes
+
+    # second plan - nothing has changed so should report no changes
+    assert not ctx.plan(auto_apply=True, no_prompts=True).has_changes