Feat: Add support for dbt transaction in hooks

Author: themisvaltinos

sqlmesh/core/model/common.py

@@ -663,6 +663,7 @@ def parse_strings_with_macro_refs(value: t.Any, dialect: DialectType) -> t.Any:
 
 class ParsableSql(PydanticModel):
     sql: str
+    transaction: t.Optional[bool] = None
 
     _parsed: t.Optional[exp.Expression] = None
     _parsed_dialect: t.Optional[str] = None

sqlmesh/core/model/definition.py

@@ -363,6 +363,7 @@ def render_pre_statements(
         expand: t.Iterable[str] = tuple(),
         deployability_index: t.Optional[DeployabilityIndex] = None,
         engine_adapter: t.Optional[EngineAdapter] = None,
+        inside_transaction: t.Optional[bool] = True,
         **kwargs: t.Any,
     ) -> t.List[exp.Expression]:
         """Renders pre-statements for a model.
@@ -384,7 +385,11 @@ def render_pre_statements(
             The list of rendered expressions.
         """
         return self._render_statements(
-            self.pre_statements,
+            [
+                stmt
+                for stmt in self.pre_statements
+                if stmt.args.get("transaction", True) == inside_transaction
+            ],
             start=start,
             end=end,
             execution_time=execution_time,
@@ -405,6 +410,7 @@ def render_post_statements(
         expand: t.Iterable[str] = tuple(),
         deployability_index: t.Optional[DeployabilityIndex] = None,
         engine_adapter: t.Optional[EngineAdapter] = None,
+        inside_transaction: t.Optional[bool] = True,
         **kwargs: t.Any,
     ) -> t.List[exp.Expression]:
         """Renders post-statements for a model.
@@ -420,13 +426,18 @@ def render_post_statements(
                 that depend on materialized tables.  Model definitions are inlined and can thus be run end to
                 end on the fly.
             deployability_index: Determines snapshots that are deployable in the context of this render.
+            inside_transaction: Whether to render hooks with transaction=True (inside) or transaction=False (outside).
             kwargs: Additional kwargs to pass to the renderer.
 
         Returns:
             The list of rendered expressions.
         """
         return self._render_statements(
-            self.post_statements,
+            [
+                stmt
+                for stmt in self.post_statements
+                if stmt.args.get("transaction", True) == inside_transaction
+            ],
             start=start,
             end=end,
             execution_time=execution_time,
@@ -567,6 +578,8 @@ def _get_parsed_statements(self, attr_name: str) -> t.List[exp.Expression]:
         result = []
         for v in value:
             parsed = v.parse(self.dialect)
+            if getattr(v, "transaction", None) is not None:
+                parsed.set("transaction", v.transaction)
             if not isinstance(parsed, exp.Semicolon):
                 result.append(parsed)
         return result
@@ -2592,9 +2605,17 @@ def _create_model(
         if statement_field in kwargs:
             # Macros extracted from these statements need to be treated as metadata only
             is_metadata = statement_field == "on_virtual_update"
-            statements.extend((stmt, is_metadata) for stmt in kwargs[statement_field])
+            for stmt in kwargs[statement_field]:
+                # Extract the expression if it's ParsableSql already
+                expr = stmt.parse(dialect) if isinstance(stmt, ParsableSql) else stmt
+                statements.append((expr, is_metadata))
             kwargs[statement_field] = [
-                ParsableSql.from_parsed_expression(stmt, dialect, use_meta_sql=use_original_sql)
+                # this to retain the transaction information
+                stmt
+                if isinstance(stmt, ParsableSql)
+                else ParsableSql.from_parsed_expression(
+                    stmt, dialect, use_meta_sql=use_original_sql
+                )
                 for stmt in kwargs[statement_field]
             ]
 

sqlmesh/core/snapshot/evaluator.py

@@ -750,13 +750,19 @@ def _evaluate_snapshot(
             **render_statements_kwargs
         )
 
+        evaluation_strategy = _evaluation_strategy(snapshot, adapter)
+        evaluation_strategy.run_pre_statements(
+            snapshot=snapshot,
+            render_kwargs={**render_statements_kwargs, "inside_transaction": False},
+        )
+
         with (
             adapter.transaction(),
             adapter.session(snapshot.model.render_session_properties(**render_statements_kwargs)),
         ):
-            evaluation_strategy = _evaluation_strategy(snapshot, adapter)
             evaluation_strategy.run_pre_statements(
-                snapshot=snapshot, render_kwargs=render_statements_kwargs
+                snapshot=snapshot,
+                render_kwargs={**render_statements_kwargs, "inside_transaction": True},
             )
 
             if not target_table_exists or (model.is_seed and not snapshot.intervals):
@@ -828,10 +834,16 @@ def _evaluate_snapshot(
             )
 
             evaluation_strategy.run_post_statements(
-                snapshot=snapshot, render_kwargs=render_statements_kwargs
+                snapshot=snapshot,
+                render_kwargs={**render_statements_kwargs, "inside_transaction": True},
             )
 
-            return wap_id
+        evaluation_strategy.run_post_statements(
+            snapshot=snapshot,
+            render_kwargs={**render_statements_kwargs, "inside_transaction": False},
+        )
+
+        return wap_id
 
     def create_snapshot(
         self,
@@ -865,6 +877,11 @@ def create_snapshot(
             deployability_index=deployability_index,
         )
 
+        evaluation_strategy = _evaluation_strategy(snapshot, adapter)
+        evaluation_strategy.run_pre_statements(
+            snapshot=snapshot, render_kwargs={**create_render_kwargs, "inside_transaction": False}
+        )
+
         with (
             adapter.transaction(),
             adapter.session(snapshot.model.render_session_properties(**create_render_kwargs)),
@@ -896,6 +913,10 @@ def create_snapshot(
                     dry_run=True,
                 )
 
+        evaluation_strategy.run_post_statements(
+            snapshot=snapshot, render_kwargs={**create_render_kwargs, "inside_transaction": False}
+        )
+
         if on_complete is not None:
             on_complete(snapshot)
 
@@ -1097,6 +1118,11 @@ def _migrate_snapshot(
         )
         target_table_name = snapshot.table_name()
 
+        evaluation_strategy = _evaluation_strategy(snapshot, adapter)
+        evaluation_strategy.run_pre_statements(
+            snapshot=snapshot, render_kwargs={**render_kwargs, "inside_transaction": False}
+        )
+
         with (
             adapter.transaction(),
             adapter.session(snapshot.model.render_session_properties(**render_kwargs)),
@@ -1134,6 +1160,10 @@ def _migrate_snapshot(
                     dry_run=True,
                 )
 
+        evaluation_strategy.run_post_statements(
+            snapshot=snapshot, render_kwargs={**render_kwargs, "inside_transaction": False}
+        )
+
     # Retry in case when the table is migrated concurrently from another plan application
     @retry(
         reraise=True,
@@ -1454,7 +1484,8 @@ def _execute_create(
         }
         if run_pre_post_statements:
             evaluation_strategy.run_pre_statements(
-                snapshot=snapshot, render_kwargs=create_render_kwargs
+                snapshot=snapshot,
+                render_kwargs={**create_render_kwargs, "inside_transaction": True},
             )
         evaluation_strategy.create(
             table_name=table_name,
@@ -1471,7 +1502,8 @@ def _execute_create(
         )
         if run_pre_post_statements:
             evaluation_strategy.run_post_statements(
-                snapshot=snapshot, render_kwargs=create_render_kwargs
+                snapshot=snapshot,
+                render_kwargs={**create_render_kwargs, "inside_transaction": True},
             )
 
     def _can_clone(self, snapshot: Snapshot, deployability_index: DeployabilityIndex) -> bool:
@@ -2944,12 +2976,20 @@ def append(
         )
 
     def run_pre_statements(self, snapshot: Snapshot, render_kwargs: t.Any) -> None:
-        # in dbt custom materialisations it's up to the user when to run the pre hooks
-        pass
+        # in dbt custom materialisations it's up to the user to run the pre hooks inside the transaction
+        if not render_kwargs.get("inside_transaction", True):
+            super().run_pre_statements(
+                snapshot=snapshot,
+                render_kwargs=render_kwargs,
+            )
 
     def run_post_statements(self, snapshot: Snapshot, render_kwargs: t.Any) -> None:
-        # in dbt custom materialisations it's up to the user when to run the post hooks
-        pass
+        # in dbt custom materialisations it's up to the user to run the post hooks inside the transaction
+        if not render_kwargs.get("inside_transaction", True):
+            super().run_post_statements(
+                snapshot=snapshot,
+                render_kwargs=render_kwargs,
+            )
 
     def _execute_materialization(
         self,
@@ -2985,14 +3025,15 @@ def _execute_materialization(
             "sql": str(query_or_df),
             "is_first_insert": is_first_insert,
             "create_only": create_only,
-            # FIXME: Add support for transaction=False
             "pre_hooks": [
-                AttributeDict({"sql": s.this.this, "transaction": True})
+                AttributeDict({"sql": s.this.this, "transaction": transaction})
                 for s in model.pre_statements
+                if (transaction := s.args.get("transaction", True))
             ],
             "post_hooks": [
-                AttributeDict({"sql": s.this.this, "transaction": True})
+                AttributeDict({"sql": s.this.this, "transaction": transaction})
                 for s in model.post_statements
+                if (transaction := s.args.get("transaction", True))
             ],
             "model_instance": model,
             **kwargs,

sqlmesh/dbt/basemodel.py

@@ -13,6 +13,7 @@
 from sqlmesh.core.config.base import UpdateStrategy
 from sqlmesh.core.config.common import VirtualEnvironmentMode
 from sqlmesh.core.model import Model
+from sqlmesh.core.model.common import ParsableSql
 from sqlmesh.core.node import DbtNodeInfo
 from sqlmesh.dbt.column import (
     ColumnConfig,
@@ -87,7 +88,7 @@ class Hook(DbtConfig):
     """
 
     sql: SqlStr
-    transaction: bool = True  # TODO not yet supported
+    transaction: bool = True
 
     _sql_validator = sql_str_validator
 
@@ -339,8 +340,14 @@ def sqlmesh_model_kwargs(
             ),
             "jinja_macros": jinja_macros,
             "path": self.path,
-            "pre_statements": [d.jinja_statement(hook.sql) for hook in self.pre_hook],
-            "post_statements": [d.jinja_statement(hook.sql) for hook in self.post_hook],
+            "pre_statements": [
+                ParsableSql(sql=d.jinja_statement(hook.sql).sql(), transaction=hook.transaction)
+                for hook in self.pre_hook
+            ],
+            "post_statements": [
+                ParsableSql(sql=d.jinja_statement(hook.sql).sql(), transaction=hook.transaction)
+                for hook in self.post_hook
+            ],
             "tags": self.tags,
             "physical_schema_mapping": context.sqlmesh_config.physical_schema_mapping,
             "default_catalog": context.target.database,

tests/core/test_snapshot_evaluator.py

@@ -3232,11 +3232,11 @@ def test_create_post_statements_use_non_deployable_table(
     evaluator.create([snapshot], {}, DeployabilityIndex.none_deployable())
 
     call_args = adapter_mock.execute.call_args_list
-    pre_calls = call_args[0][0][0]
+    pre_calls = call_args[1][0][0]
     assert len(pre_calls) == 1
     assert pre_calls[0].sql(dialect="postgres") == expected_call
 
-    post_calls = call_args[1][0][0]
+    post_calls = call_args[2][0][0]
     assert len(post_calls) == 1
     assert post_calls[0].sql(dialect="postgres") == expected_call
 
@@ -3294,11 +3294,11 @@ def model_with_statements(context, **kwargs):
     expected_call = f'CREATE INDEX IF NOT EXISTS "idx" ON "sqlmesh__db"."db__test_model__{snapshot.version}__dev" /* db.test_model */("id")'
 
     call_args = adapter_mock.execute.call_args_list
-    pre_calls = call_args[0][0][0]
+    pre_calls = call_args[1][0][0]
     assert len(pre_calls) == 1
     assert pre_calls[0].sql(dialect="postgres") == expected_call
 
-    post_calls = call_args[1][0][0]
+    post_calls = call_args[2][0][0]
     assert len(post_calls) == 1
     assert post_calls[0].sql(dialect="postgres") == expected_call
 
@@ -3356,14 +3356,14 @@ def create_log_table(evaluator, view_name):
     )
 
     call_args = adapter_mock.execute.call_args_list
-    post_calls = call_args[1][0][0]
+    post_calls = call_args[2][0][0]
     assert len(post_calls) == 1
     assert (
         post_calls[0].sql(dialect="postgres")
         == f'CREATE INDEX IF NOT EXISTS "test_idx" ON "sqlmesh__test_schema"."test_schema__test_model__{snapshot.version}__dev" /* test_schema.test_model */("a")'
     )
 
-    on_virtual_update_calls = call_args[2][0][0]
+    on_virtual_update_calls = call_args[4][0][0]
     assert (
         on_virtual_update_calls[0].sql(dialect="postgres")
         == 'GRANT SELECT ON VIEW "test_schema__test_env"."test_model" /* test_schema.test_model */ TO ROLE "admin"'
@@ -3441,7 +3441,7 @@ def model_with_statements(context, **kwargs):
     )
 
     call_args = adapter_mock.execute.call_args_list
-    on_virtual_update_call = call_args[2][0][0][0]
+    on_virtual_update_call = call_args[4][0][0][0]
     assert (
         on_virtual_update_call.sql(dialect="postgres")
         == 'CREATE INDEX IF NOT EXISTS "idx" ON "db"."test_model_3" /* db.test_model_3 */("id")'
@@ -4187,11 +4187,11 @@ def test_multiple_engine_creation(snapshot: Snapshot, adapters, make_snapshot):
     assert view_args[1][0][0] == "test_schema__test_env.test_model"
 
     call_args = engine_adapters["secondary"].execute.call_args_list
-    pre_calls = call_args[0][0][0]
+    pre_calls = call_args[1][0][0]
     assert len(pre_calls) == 1
     assert pre_calls[0].sql(dialect="postgres") == expected_call
 
-    post_calls = call_args[1][0][0]
+    post_calls = call_args[2][0][0]
     assert len(post_calls) == 1
     assert post_calls[0].sql(dialect="postgres") == expected_call
 
@@ -4459,7 +4459,7 @@ def model_with_statements(context, **kwargs):
 
     # For the pre/post statements verify the model-specific gateway was used
     engine_adapters["default"].execute.assert_called_once()
-    assert len(engine_adapters["secondary"].execute.call_args_list) == 2
+    assert len(engine_adapters["secondary"].execute.call_args_list) == 4
 
     # Validate that the get_catalog_type method was called only on the secondary engine from the macro evaluator
     engine_adapters["default"].get_catalog_type.assert_not_called()