fix: Ensure no duplicates in fv.schema (#3460)

* Ensure no duplicates in `fv.schema`

Signed-off-by: Felix Wang <wangfelix98@gmail.com>

* Fix `Field.__eq__` to check all attributes

Signed-off-by: Felix Wang <wangfelix98@gmail.com>

Signed-off-by: Felix Wang <wangfelix98@gmail.com>

sdk/python/feast/feature_view.py

@@ -259,7 +259,7 @@ def join_keys(self) -> List[str]:
 
     @property
     def schema(self) -> List[Field]:
-        return self.entity_columns + self.features
+        return list(set(self.entity_columns + self.features))
 
     def ensure_valid(self):
         """

sdk/python/feast/field.py

@@ -30,11 +30,13 @@ class Field:
     Attributes:
         name: The name of the field.
         dtype: The type of the field, such as string or float.
-        tags (optional): User-defined metadata in dictionary form.
+        description: A human-readable description.
+        tags: User-defined metadata in dictionary form.
     """
 
     name: str
     dtype: FeastType
+    description: str
     tags: Dict[str, str]
 
     def __init__(
@@ -51,6 +53,7 @@ def __init__(
         Args:
             name: The name of the field.
             dtype: The type of the field, such as string or float.
+            description (optional): A human-readable description.
             tags (optional): User-defined metadata in dictionary form.
         """
         self.name = name
@@ -65,6 +68,7 @@ def __eq__(self, other):
         if (
             self.name != other.name
             or self.dtype != other.dtype
+            or self.description != other.description
             or self.tags != other.tags
         ):
             return False