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Posted to issues@beam.apache.org by "Rui Wang (Jira)" <ji...@apache.org> on 2019/09/03 15:55:00 UTC

[jira] [Assigned] (BEAM-7049) Merge multiple input to one BeamUnionRel

     [ https://issues.apache.org/jira/browse/BEAM-7049?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rui Wang reassigned BEAM-7049:
------------------------------

    Assignee: sridhar Reddy

> 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: 20m
>  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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