fix: Fix DataSource constructor to unbreak custom data sources

Signed-off-by: Achal Shah <[email protected]>

sdk/python/feast/data_source.py

@@ -14,6 +14,7 @@
 
 
 import enum
+import warnings
 from abc import ABC, abstractmethod
 from typing import Any, Callable, Dict, Iterable, Optional, Tuple
 
@@ -179,14 +180,15 @@ class DataSource(ABC):
 
     def __init__(
         self,
-        name: str,
+        *,
         event_timestamp_column: Optional[str] = None,
         created_timestamp_column: Optional[str] = None,
         field_mapping: Optional[Dict[str, str]] = None,
         date_partition_column: Optional[str] = None,
         description: Optional[str] = "",
         tags: Optional[Dict[str, str]] = None,
         owner: Optional[str] = "",
+        name: Optional[str] = None,
     ):
         """
         Creates a DataSource object.
@@ -205,7 +207,13 @@ def __init__(
             owner (optional): The owner of the data source, typically the email of the primary
                 maintainer.
         """
-        self.name = name
+        if not name:
+            warnings.warn(
+                ("Names for data sources need to be supplied. "
+                 "Data sources without names will no tbe supported after Feast 0.23."),
+                UserWarning
+            )
+        self.name = name or ""
         self.event_timestamp_column = (
             event_timestamp_column if event_timestamp_column else ""
         )