Robert Bradshaw created BEAM-14464:
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Summary: Optimize precombining table.
Key: BEAM-14464
URL: https://issues.apache.org/jira/browse/BEAM-14464
Project: Beam
Issue Type: Bug
Components: sdk-java-core
Reporter: Robert Bradshaw
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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