TheNeuralBit commented on a change in pull request #14174:
URL: https://github.com/apache/beam/pull/14174#discussion_r590679919
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File path: sdks/python/apache_beam/transforms/join/keyedpcollectiontuple.py
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@@ -0,0 +1,162 @@
+
+from typing import Any, Generic, List, TypeVar
+import apache_beam as beam
+from apache_beam.typehints import typehints
+from apache_beam.coders.coders import Coder
+
+K = TypeVar("K")
+V = TypeVar("V")
+InputT = TypeVar("InputT")
+OutputT = TypeVar("OutputT")
+
+class KeyedPCollectionTuple(Generic[K]):
Review comment:
I think it should be possible to add the Join library to Python without
porting `KeyedPCollectionTuple`. In Java this is necessary for CoGroupByKey,
but in Python we represent tagged/keyed PCollections as `Dict[str,
PCollection]`, you can see how this works with CoGroupByKey in that transform's
API docs:
https://beam.apache.org/releases/pydoc/2.28.0/apache_beam.transforms.util.html#apache_beam.transforms.util.CoGroupByKey
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