Yifan Mai created BEAM-8520:
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Summary: Expansion of _CombinePerKeyWithHotKeyFanout has no
typehints
Key: BEAM-8520
URL: https://issues.apache.org/jira/browse/BEAM-8520
Project: Beam
Issue Type: Bug
Components: sdk-py-core
Reporter: Yifan Mai
The expansion of
[_CombinePerKeyWithHotKeyFanout|https://github.com/apache/beam/blob/bd09a038f4df896ef6d903a4944083fcd2e8f727/sdks/python/apache_beam/transforms/core.py#L1913],
which is used by
[CombinePerKey.with_hot_key_fanout()|https://github.com/apache/beam/blob/bd09a038f4df896ef6d903a4944083fcd2e8f727/sdks/python/apache_beam/transforms/core.py#L1734],
uses DoFns (SplitHotCold) and CombineFns (PreCombineFn, PostCombineFn) and a
lambda (SplitNonce) that have no typehints. If the user specified a typehints
on the original CombineFn, the typehints are lost. This means that the fallback
coder rather than the user specified coder.
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