Fix: Hydrate the seed model if needed in the built-in scheduler (#859)

Author: izeigerman

setup.py

@@ -40,7 +40,7 @@
         "hyperscript",
         "jinja2",
         "pandas",
-        "pydantic>=1.9.1,<2.0.0",
+        "pydantic>=1.10.7,<2.0.0",
         "requests",
         "rich",
         "ruamel.yaml",

sqlmesh/core/scheduler.py

@@ -6,6 +6,7 @@
 
 from sqlmesh.core import constants as c
 from sqlmesh.core.console import Console, get_console
+from sqlmesh.core.model import SeedModel
 from sqlmesh.core.snapshot import (
     Snapshot,
     SnapshotEvaluator,
@@ -116,6 +117,11 @@ def evaluate(
             snapshot.name: snapshot,
         }
 
+        if isinstance(snapshot.model, SeedModel) and not snapshot.model.is_hydrated:
+            snapshot = self.state_sync.get_snapshots([snapshot], hydrate_seeds=True)[
+                snapshot.snapshot_id
+            ]
+
         self.snapshot_evaluator.evaluate(
             snapshot,
             start,