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https://issues.apache.org/jira/browse/BEAM-3721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546893#comment-17546893
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Kenneth Knowles commented on BEAM-3721:
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This issue has been migrated to https://github.com/apache/beam/issues/18705
> UNION ALL should be implemented via Flatten
> -------------------------------------------
>
> Key: BEAM-3721
> URL: https://issues.apache.org/jira/browse/BEAM-3721
> Project: Beam
> Issue Type: Improvement
> Components: dsl-sql
> Reporter: Kenneth Knowles
> Priority: P3
>
> Currently, UNION ALL is implemented as an abstracted set operation that goes
> through CoGroupByKey, when a flatten will do. This is also incompatible with
> triggers that fire more than once.
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