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https://issues.apache.org/jira/browse/BEAM-7100?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on BEAM-7100 started by Rui Wang.
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> BeamValuesRel should accept empty tuples
> ----------------------------------------
>
> Key: BEAM-7100
> URL: https://issues.apache.org/jira/browse/BEAM-7100
> Project: Beam
> Issue Type: New Feature
> Components: dsl-sql
> Reporter: Rui Wang
> Assignee: Rui Wang
> Priority: Major
>
> It is possible for a OUTER JOIN, one side of JOIN contains no tuples. Right
> now such case will thrown an exception with "empty tuples are not allowed".
> However, for OUTER JOIN, empty values on one side can still produce results
> if another side has tuples.
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