kennknowles commented on a change in pull request #10972: Add
DeduplicationByUniqueId transform
URL: https://github.com/apache/beam/pull/10972#discussion_r386535161
##########
File path: sdks/python/apache_beam/runners/portability/fn_api_runner_test.py
##########
@@ -543,6 +545,15 @@ def process(
self.assertEqual(1, len(counters))
self.assertEqual(counters[0].committed, len(''.join(data)))
+ def test_deduplication_by_id(self):
+ with self.create_pipeline() as p:
+ res = (p
+ | beam.Create([('id_1', 'value_1'),
+ ('id_2', 'value_2'),
+ ('id_1', 'value_1')])
+ | DeduplicationByUniqueId())
Review comment:
I understand. It does allow inconsistency but not too much risk since anyone
will immediately see that a key might have two values and they have to be
careful. FWIW in Java is it arranged slightly differently into
[`Distinct.withRepresentativeValues`](https://github.com/apache/beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/Distinct.java#L81).
But that way is not as cross-language-friendly as precomputing the keys.
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