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https://issues.apache.org/jira/browse/BEAM-14464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17550113#comment-17550113
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Danny McCormick commented on BEAM-14464:
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This issue has been migrated to https://github.com/apache/beam/issues/21675
> Optimize precombining table.
> ----------------------------
>
> Key: BEAM-14464
> URL: https://issues.apache.org/jira/browse/BEAM-14464
> Project: Beam
> Issue Type: Improvement
> Components: sdk-java-core
> Reporter: Robert Bradshaw
> Priority: P2
> Time Spent: 50m
> Remaining Estimate: 0h
>
> The current code constructs, hashes, and compares full WindowedValues for the
> grouping key, which ends up dominating the time spent in the combining table
> when using trivial combiners (like Sum.integers()). We only need compare the
> (structural value of the) key and windows, and can emit the windows in the
> global case.
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