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Posted to issues@beam.apache.org by "Yifan Mai (Jira)" <ji...@apache.org> on 2019/10/30 17:40:00 UTC

[jira] [Created] (BEAM-8520) Expansion of _CombinePerKeyWithHotKeyFanout has no typehints

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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