Fix: Preserve the DAG evaluation order even when a transitive dependency is not included

Author: izeigerman

sqlmesh/core/scheduler.py

@@ -445,7 +445,13 @@ def run_merged_intervals(
         if not selected_snapshots:
             selected_snapshots = list(merged_intervals)
 
-        snapshot_dag = snapshots_to_dag(selected_snapshots)
+        # Build the full DAG from all snapshots to preserve transitive dependencies
+        full_dag = snapshots_to_dag(self.snapshots.values())
+
+        # Create a subdag that includes the selected snapshots and all their upstream dependencies
+        # This ensures that transitive dependencies are preserved even when intermediate nodes are not selected
+        selected_snapshot_ids_set = {s.snapshot_id for s in selected_snapshots}
+        snapshot_dag = full_dag.subdag(*selected_snapshot_ids_set)
 
         batched_intervals = self.batch_intervals(
             merged_intervals, deployability_index, environment_naming_info, dag=snapshot_dag
@@ -641,21 +647,29 @@ def _dag(
 
             upstream_dependencies: t.List[SchedulingUnit] = []
 
-            for p_sid in snapshot.parents:
-                if p_sid in self.snapshots:
-                    p_intervals = intervals_per_snapshot.get(p_sid.name, [])
+            def find_upstream_dependencies(sid: SnapshotId) -> t.List[SchedulingUnit]:
+                if sid not in self.snapshots:
+                    return []
+
+                p_intervals = intervals_per_snapshot.get(sid.name, [])
+
+                if p_intervals:
+                    if len(p_intervals) > 1:
+                        return [DummyNode(snapshot_name=sid.name)]
+                    interval = p_intervals[0]
+                    return [EvaluateNode(snapshot_name=sid.name, interval=interval, batch_index=0)]
+                if sid in original_snapshots_to_create:
+                    return [CreateNode(snapshot_name=sid.name)]
+                # This snapshot has no intervals and doesn't need creation which means
+                # that it can be a transitive dependency
+                transitive_deps: t.List[SchedulingUnit] = []
+                parent_snapshot = self.snapshots[sid]
+                for grandparent_sid in parent_snapshot.parents:
+                    transitive_deps.extend(find_upstream_dependencies(grandparent_sid))
+                return transitive_deps
 
-                    if not p_intervals and p_sid in original_snapshots_to_create:
-                        upstream_dependencies.append(CreateNode(snapshot_name=p_sid.name))
-                    elif len(p_intervals) > 1:
-                        upstream_dependencies.append(DummyNode(snapshot_name=p_sid.name))
-                    else:
-                        for i, interval in enumerate(p_intervals):
-                            upstream_dependencies.append(
-                                EvaluateNode(
-                                    snapshot_name=p_sid.name, interval=interval, batch_index=i
-                                )
-                            )
+            for p_sid in snapshot.parents:
+                upstream_dependencies.extend(find_upstream_dependencies(p_sid))
 
             batch_concurrency = snapshot.node.batch_concurrency
             batch_size = snapshot.node.batch_size

tests/core/test_integration.py

@@ -1672,6 +1672,83 @@ def test_plan_ignore_cron(
     )
 
 
+@time_machine.travel("2023-01-08 15:00:00 UTC")
+def test_run_respects_excluded_transitive_dependencies(init_and_plan_context: t.Callable):
+    context, _ = init_and_plan_context("examples/sushi")
+
+    # Graph: C <- B <- A
+    # B is a transitive dependency linking A and C
+    # Note that the alphabetical ordering of the model names is intentional and helps
+    # surface the problem
+    expressions_a = d.parse(
+        f"""
+        MODEL (
+            name memory.sushi.test_model_c,
+            kind FULL,
+            allow_partials true,
+            cron '@hourly',
+        );
+
+        SELECT @execution_ts AS execution_ts
+        """
+    )
+    model_c = load_sql_based_model(expressions_a)
+    context.upsert_model(model_c)
+
+    # A VIEW model with no partials allowed and a daily cron instead of hourly.
+    expressions_b = d.parse(
+        f"""
+        MODEL (
+            name memory.sushi.test_model_b,
+            kind VIEW,
+            allow_partials false,
+            cron '@daily',
+        );
+
+        SELECT * FROM memory.sushi.test_model_c
+        """
+    )
+    model_b = load_sql_based_model(expressions_b)
+    context.upsert_model(model_b)
+
+    expressions_a = d.parse(
+        f"""
+        MODEL (
+            name memory.sushi.test_model_a,
+            kind FULL,
+            allow_partials true,
+            cron '@hourly',
+        );
+
+        SELECT * FROM memory.sushi.test_model_b
+        """
+    )
+    model_a = load_sql_based_model(expressions_a)
+    context.upsert_model(model_a)
+
+    context.plan("prod", skip_tests=True, auto_apply=True, no_prompts=True)
+    assert (
+        context.fetchdf("SELECT execution_ts FROM memory.sushi.test_model_c")["execution_ts"].iloc[
+            0
+        ]
+        == "2023-01-08 15:00:00"
+    )
+
+    with time_machine.travel("2023-01-08 17:00:00 UTC", tick=False):
+        context.run(
+            "prod",
+            select_models=["*test_model_c", "*test_model_a"],
+            no_auto_upstream=True,
+            ignore_cron=True,
+        )
+        assert (
+            context.fetchdf("SELECT execution_ts FROM memory.sushi.test_model_a")[
+                "execution_ts"
+            ].iloc[0]
+            == "2023-01-08 17:00:00"
+        )
+
+
 @time_machine.travel("2023-01-08 15:00:00 UTC")
 def test_run_with_select_models_no_auto_upstream(
     init_and_plan_context: t.Callable,

tests/core/test_scheduler.py

@@ -32,6 +32,7 @@
     SnapshotEvaluator,
     SnapshotChangeCategory,
     DeployabilityIndex,
+    snapshots_to_dag,
 )
 from sqlmesh.utils.date import to_datetime, to_timestamp, DatetimeRanges, TimeLike
 from sqlmesh.utils.errors import CircuitBreakerError, NodeAuditsErrors
@@ -1019,3 +1020,109 @@ def record_execute_environment_statements(*args, **kwargs):
     execute_env_idx = call_order.index("execute_environment_statements")
     snapshots_to_create_idx = call_order.index("get_snapshots_to_create")
     assert env_statements_idx < execute_env_idx < snapshots_to_create_idx
+
+
+def test_dag_transitive_deps(mocker: MockerFixture, make_snapshot):
+    # Create a simple dependency chain: A <- B <- C
+    snapshot_a = make_snapshot(SqlModel(name="a", query=parse_one("SELECT 1 as id")))
+    snapshot_b = make_snapshot(SqlModel(name="b", query=parse_one("SELECT * FROM a")))
+    snapshot_c = make_snapshot(SqlModel(name="c", query=parse_one("SELECT * FROM b")))
+
+    snapshot_b = snapshot_b.model_copy(update={"parents": (snapshot_a.snapshot_id,)})
+    snapshot_c = snapshot_c.model_copy(update={"parents": (snapshot_b.snapshot_id,)})
+
+    snapshot_a.categorize_as(SnapshotChangeCategory.BREAKING)
+    snapshot_b.categorize_as(SnapshotChangeCategory.BREAKING)
+    snapshot_c.categorize_as(SnapshotChangeCategory.BREAKING)
+
+    scheduler = Scheduler(
+        snapshots=[snapshot_a, snapshot_b, snapshot_c],
+        snapshot_evaluator=mocker.Mock(),
+        state_sync=mocker.Mock(),
+        default_catalog=None,
+    )
+
+    # Test scenario: select only A and C (skip B)
+    merged_intervals = {
+        snapshot_a: [(to_timestamp("2023-01-01"), to_timestamp("2023-01-02"))],
+        snapshot_c: [(to_timestamp("2023-01-01"), to_timestamp("2023-01-02"))],
+    }
+
+    deployability_index = DeployabilityIndex.create([snapshot_a, snapshot_b, snapshot_c])
+
+    full_dag = snapshots_to_dag([snapshot_a, snapshot_b, snapshot_c])
+
+    dag = scheduler._dag(merged_intervals, snapshot_dag=full_dag)
+    assert dag.graph == {
+        EvaluateNode(
+            snapshot_name='"a"',
+            interval=(to_timestamp("2023-01-01"), to_timestamp("2023-01-02")),
+            batch_index=0,
+        ): set(),
+        EvaluateNode(
+            snapshot_name='"c"',
+            interval=(to_timestamp("2023-01-01"), to_timestamp("2023-01-02")),
+            batch_index=0,
+        ): {
+            EvaluateNode(
+                snapshot_name='"a"',
+                interval=(to_timestamp("2023-01-01"), to_timestamp("2023-01-02")),
+                batch_index=0,
+            )
+        },
+    }
+
+
+def test_dag_multiple_chain_transitive_deps(mocker: MockerFixture, make_snapshot):
+    # Create a more complex dependency graph:
+    # A <- B <- D <- E
+    # A <- C <- D <- E
+    # Select A and E only
+    snapshots = {}
+    for name in ["a", "b", "c", "d", "e"]:
+        snapshots[name] = make_snapshot(SqlModel(name=name, query=parse_one("SELECT 1 as id")))
+        snapshots[name].categorize_as(SnapshotChangeCategory.BREAKING)
+
+    # Set up dependencies
+    snapshots["b"] = snapshots["b"].model_copy(update={"parents": (snapshots["a"].snapshot_id,)})
+    snapshots["c"] = snapshots["c"].model_copy(update={"parents": (snapshots["a"].snapshot_id,)})
+    snapshots["d"] = snapshots["d"].model_copy(
+        update={"parents": (snapshots["b"].snapshot_id, snapshots["c"].snapshot_id)}
+    )
+    snapshots["e"] = snapshots["e"].model_copy(update={"parents": (snapshots["d"].snapshot_id,)})
+
+    scheduler = Scheduler(
+        snapshots=list(snapshots.values()),
+        snapshot_evaluator=mocker.Mock(),
+        state_sync=mocker.Mock(),
+        default_catalog=None,
+    )
+
+    # Only provide intervals for A and E
+    batched_intervals = {
+        snapshots["a"]: [(to_timestamp("2023-01-01"), to_timestamp("2023-01-02"))],
+        snapshots["e"]: [(to_timestamp("2023-01-01"), to_timestamp("2023-01-02"))],
+    }
+
+    # Create subdag including transitive dependencies
+    full_dag = snapshots_to_dag(snapshots.values())
+
+    dag = scheduler._dag(batched_intervals, snapshot_dag=full_dag)
+    assert dag.graph == {
+        EvaluateNode(
+            snapshot_name='"a"',
+            interval=(to_timestamp("2023-01-01"), to_timestamp("2023-01-02")),
+            batch_index=0,
+        ): set(),
+        EvaluateNode(
+            snapshot_name='"e"',
+            interval=(to_timestamp("2023-01-01"), to_timestamp("2023-01-02")),
+            batch_index=0,
+        ): {
+            EvaluateNode(
+                snapshot_name='"a"',
+                interval=(to_timestamp("2023-01-01"), to_timestamp("2023-01-02")),
+                batch_index=0,
+            )
+        },
+    }