[GitHub] [beam] nehsyc commented on a change in pull request #13474: [BEAM-10475] Add typehints for ShardedKeyCoder

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nehsyc commented on a change in pull request #13474:
URL: https://github.com/apache/beam/pull/13474#discussion_r535705683



##########
File path: sdks/python/apache_beam/typehints/sharded_key_type.py
##########
@@ -0,0 +1,69 @@
+#
+# 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.
+#
+
+# pytype: skip-file
+
+from __future__ import absolute_import
+
+from apache_beam.coders import typecoders
+from apache_beam.coders.coders import ShardedKeyCoder
+from apache_beam.typehints import typehints
+from apache_beam.utils.sharded_key import ShardedKey
+
+
+class ShardedKeyTypeConstraint(typehints.TypeConstraint):

Review comment:
       Users or dev may use it for specifying the output type of a transform to provide type hints.

##########
File path: sdks/python/apache_beam/coders/coders.py
##########
@@ -1485,6 +1486,21 @@ def as_cloud_object(self, coders_context=None):
         ],
     }
 
+  def to_type_hint(self):
+    from apache_beam.typehints import sharded_key_type

Review comment:
       To avoid circular import.




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