[Python] Vertex AI Feature Store enrichment handler

CHANGES.md

@@ -77,6 +77,7 @@
 * Redis cache support added to RequestResponseIO and Enrichment transform (Python) ([#30307](https://github.com/apache/beam/pull/30307))
 * Merged sdks/java/fn-execution and runners/core-construction-java into the main SDK. These artifacts were never meant for users, but noting
   that they no longer exist. These are steps to bring portability into the core SDK alongside all other core functionality.
+* Added Vertex AI Feature Store handler for Enrichment transform (Python) ([#30388](https://github.com/apache/beam/pull/30388))
 
 ## Breaking Changes
 

sdks/python/apache_beam/transforms/enrichment.py

@@ -161,8 +161,10 @@ def expand(self,
         throttler=self._throttler)
 
     # EnrichmentSourceHandler returns a tuple of (request,response).
-    return fetched_data | beam.Map(
-        lambda x: self._join_fn(x[0]._asdict(), x[1]._asdict()))
+    return (
+        fetched_data
+        | "enrichment_join" >>
+        beam.Map(lambda x: self._join_fn(x[0]._asdict(), x[1]._asdict())))
 
   def with_redis_cache(
       self,

sdks/python/apache_beam/transforms/enrichment_handlers/bigtable.py

@@ -15,7 +15,6 @@
 # limitations under the License.
 #
 import logging
-from enum import Enum
 from typing import Any
 from typing import Dict
 from typing import Optional
@@ -28,30 +27,15 @@
 
 import apache_beam as beam
 from apache_beam.transforms.enrichment import EnrichmentSourceHandler
+from apache_beam.transforms.enrichment_handlers.utils import ExceptionLevel
 
 __all__ = [
     'BigTableEnrichmentHandler',
-    'ExceptionLevel',
 ]
 
 _LOGGER = logging.getLogger(__name__)
 
 
-class ExceptionLevel(Enum):
-  """ExceptionLevel defines the exception level options to either
-  log a warning, or raise an exception, or do nothing when a BigTable query
-  returns an empty row.
-
-  Members:
-    - RAISE: Raise the exception.
-    - WARN: Log a warning for exception without raising it.
-    - QUIET: Neither log nor raise the exception.
-  """
-  RAISE = 0
-  WARN = 1
-  QUIET = 2
-
-
 class BigTableEnrichmentHandler(EnrichmentSourceHandler[beam.Row, beam.Row]):
   """A handler for :class:`apache_beam.transforms.enrichment.Enrichment`
   transform to interact with GCP BigTable.
@@ -70,7 +54,7 @@ class BigTableEnrichmentHandler(EnrichmentSourceHandler[beam.Row, beam.Row]):
     encoding (str): encoding type to convert the string to bytes and vice-versa
       from BigTable. Default is `utf-8`.
     exception_level: a `enum.Enum` value from
-      ``apache_beam.transforms.enrichment_handlers.bigtable.ExceptionLevel``
+      ``apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel``
       to set the level when an empty row is returned from the BigTable query.
       Defaults to ``ExceptionLevel.WARN``.
     include_timestamp (bool): If enabled, the timestamp associated with the

sdks/python/apache_beam/transforms/enrichment_handlers/utils.py

@@ -0,0 +1,38 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+from enum import Enum
+
+__all__ = [
+    'ExceptionLevel',
+]
+
+
+class ExceptionLevel(Enum):
+  """Options to set the severity of exceptions.
+
+  You can set the exception level option to either
+  log a warning, or raise an exception, or do nothing when an empty row
+  is fetched from the external service.
+
+  Members:
+    - RAISE: Raise the exception.
+    - WARN: Log a warning for exception without raising it.
+    - QUIET: Neither log nor raise the exception.
+  """
+  RAISE = 0
+  WARN = 1
+  QUIET = 2