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https://issues.apache.org/jira/browse/BEAM-2477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16055380#comment-16055380
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James Xu commented on BEAM-2477:
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[~lzljs3620320] can you provide more info about `Combine.perKey`'s performance
is better than `GroupByKey`, e.g. some link?
> 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
> Labels: dsl_sql_merge
>
> 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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