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https://issues.apache.org/jira/browse/BEAM-3722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17145253#comment-17145253
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Beam JIRA Bot commented on BEAM-3722:
-------------------------------------
This issue was marked "stale-P2" and has not received a public comment in 14
days. It is now automatically moved to P3. If you are still affected by it, you
can comment and move it back to P2.
> UNION should be implemented via flatten & distinct
> --------------------------------------------------
>
> Key: BEAM-3722
> URL: https://issues.apache.org/jira/browse/BEAM-3722
> Project: Beam
> Issue Type: Improvement
> Components: dsl-sql
> Reporter: Kenneth Knowles
> Priority: P3
>
> Currently, UNION is implemented as a set operator via CoGroupByKey when a
> flatten + distinct will suffice. This also will be compatible with more types
> of triggers.
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