feast-dev
diff --git a/‎sdk/python/feast/feature_view_projection.py‎
Lines changed: 2 additions & 2 deletions b/‎sdk/python/feast/feature_view_projection.py‎
Lines changed: 2 additions & 2 deletions
diff --git a/‎sdk/python/tests/unit/test_feature_service.py‎
Lines changed: 19 additions & 0 deletions b/‎sdk/python/tests/unit/test_feature_service.py‎
Lines changed: 19 additions & 0 deletions
@@ -1,6 +1,6 @@
 from typing import TYPE_CHECKING, Dict, List, Optional
 
-from attr import dataclass
+from attr import dataclass, field
 
 from feast.data_source import DataSource
 from feast.field import Field
@@ -42,7 +42,7 @@ class FeatureViewProjection:
     name_alias: Optional[str]
     desired_features: List[str]
     features: List[Field]
-    join_key_map: Dict[str, str] = {}
+    join_key_map: Dict[str, str] = field(factory=dict)
     timestamp_field: Optional[str] = None
     date_partition_column: Optional[str] = None
     created_timestamp_column: Optional[str] = None
 
@@ -121,6 +121,25 @@ def test_prepare_for_apply_keeps_complete_projection():
     assert feature_service.feature_view_projections[0] == original_projection
 
 
+def test_feature_view_projections_have_independent_join_key_maps():
+    first_projection = FeatureViewProjection(
+        name="first",
+        name_alias=None,
+        desired_features=[],
+        features=[],
+    )
+    second_projection = FeatureViewProjection(
+        name="second",
+        name_alias=None,
+        desired_features=[],
+        features=[],
+    )
+
+    first_projection.join_key_map["entity_id"] = "aliased_entity_id"
+
+    assert second_projection.join_key_map == {}
+
+
 def test_build_apply_request():
     request = FeatureService.build_apply_request(
         name="my-feature-service",