Jingsong Lee created BEAM-2477:
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Summary: BeamAggregationRel should use Combine.perKey instead of
GroupByKey
Key: BEAM-2477
URL: https://issues.apache.org/jira/browse/BEAM-2477
Project: Beam
Issue Type: Improvement
Components: dsl-sql
Reporter: Jingsong Lee
Assignee: Jingsong Lee
Their semantics are the same, but the efficiency of implementation is quite
different, and at the runner level there is a lot of optimization for
`Combine.perKey`.
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