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https://issues.apache.org/jira/browse/BEAM-7049?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rui Wang reassigned BEAM-7049:
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Assignee: (was: Rui Wang)
> BeamUnionRel should work on mutiple input
> ------------------------------------------
>
> Key: BEAM-7049
> URL: https://issues.apache.org/jira/browse/BEAM-7049
> Project: Beam
> Issue Type: Improvement
> Components: dsl-sql
> Reporter: Rui Wang
> Priority: Major
>
> BeamUnionRel assumes inputs are two and rejects more. So `a UNION b UNION c`
> will have to be created as UNION(a, UNION(b, c)) and have two shuffles. If
> BeamUnionRel can handle multiple shuffles, we will have only one shuffle
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