fix: Return an empty infra object from sql registry when it doesn't exist

sdk/python/feast/infra/registry_stores/sql.py

@@ -2,7 +2,7 @@
 from datetime import datetime
 from enum import Enum
 from pathlib import Path
-from typing import Any, List, Optional, Set, Union
+from typing import Any, Callable, List, Optional, Set, Union
 
 from sqlalchemy import (  # type: ignore
     BigInteger,
@@ -560,7 +560,7 @@ def update_infra(self, infra: Infra, project: str, commit: bool = True):
         )
 
     def get_infra(self, project: str, allow_cache: bool = False) -> Infra:
-        return self._get_object(
+        infra_object = self._get_object(
             managed_infra,
             "infra_obj",
             project,
@@ -570,6 +570,8 @@ def get_infra(self, project: str, allow_cache: bool = False) -> Infra:
             "infra_proto",
             None,
         )
+        infra_object = infra_object or InfraProto()
+        return Infra.from_proto(infra_object)
 
     def apply_user_metadata(
         self,
@@ -683,11 +685,18 @@ def commit(self):
         pass
 
     def _apply_object(
-        self, table, project: str, id_field_name, obj, proto_field_name, name=None
+        self,
+        table: Table,
+        project: str,
+        id_field_name,
+        obj,
+        proto_field_name,
+        name=None,
     ):
         self._maybe_init_project_metadata(project)
 
-        name = name or obj.name
+        name = name or obj.name if hasattr(obj, "name") else None
+        assert name, f"name needs to be provided for {obj}"
         with self.engine.connect() as conn:
             update_datetime = datetime.utcnow()
             update_time = int(update_datetime.timestamp())
@@ -749,7 +758,14 @@ def _maybe_init_project_metadata(self, project):
                 conn.execute(insert_stmt)
                 usage.set_current_project_uuid(new_project_uuid)
 
-    def _delete_object(self, table, name, project, id_field_name, not_found_exception):
+    def _delete_object(
+        self,
+        table: Table,
+        name: str,
+        project: str,
+        id_field_name: str,
+        not_found_exception: Optional[Callable],
+    ):
         with self.engine.connect() as conn:
             stmt = delete(table).where(
                 getattr(table.c, id_field_name) == name, table.c.project_id == project
@@ -763,14 +779,14 @@ def _delete_object(self, table, name, project, id_field_name, not_found_exceptio
 
     def _get_object(
         self,
-        table,
-        name,
-        project,
-        proto_class,
-        python_class,
-        id_field_name,
-        proto_field_name,
-        not_found_exception,
+        table: Table,
+        name: str,
+        project: str,
+        proto_class: Any,
+        python_class: Any,
+        id_field_name: str,
+        proto_field_name: str,
+        not_found_exception: Optional[Callable],
     ):
         self._maybe_init_project_metadata(project)
 
@@ -782,10 +798,18 @@ def _get_object(
             if row:
                 _proto = proto_class.FromString(row[proto_field_name])
                 return python_class.from_proto(_proto)
-        raise not_found_exception(name, project)
+        if not_found_exception:
+            raise not_found_exception(name, project)
+        else:
+            return None
 
     def _list_objects(
-        self, table, project, proto_class, python_class, proto_field_name
+        self,
+        table: Table,
+        project: str,
+        proto_class: Any,
+        python_class: Any,
+        proto_field_name: str,
     ):
         self._maybe_init_project_metadata(project)
         with self.engine.connect() as conn: