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https://issues.apache.org/jira/browse/BEAM-7049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16929500#comment-16929500
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sridhar Reddy commented on BEAM-7049:
-------------------------------------

With the change in location of UnionMergeRule.INSTANCE it is working. I see 
inputs coming in as 5 and them being processed. 

> 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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