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https://issues.apache.org/jira/browse/BEAM-7049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16941410#comment-16941410
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sridhar Reddy commented on BEAM-7049:
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[~amaliujia] I just want to make sure that we are on the same page as far as
the next steps are concerned. At this point, I am waiting for your
instructions on how to proceed further: How to split UNION ALL and UNION and
what aspects of SQL Optimizer should be I looking at.
Please take your time to update the Jira. I just want to make sure we are
not waiting for each other.
> Merge multiple input to one BeamUnionRel
> ----------------------------------------
>
> Key: BEAM-7049
> URL: https://issues.apache.org/jira/browse/BEAM-7049
> Project: Beam
> Issue Type: Improvement
> Components: dsl-sql
> Reporter: Rui Wang
> Assignee: sridhar Reddy
> Priority: Major
> Time Spent: 1h
> Remaining Estimate: 0h
>
> 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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