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Posted to jira@arrow.apache.org by "Vibhatha Lakmal Abeykoon (Jira)" <ji...@apache.org> on 2022/08/25 05:04:00 UTC

[jira] [Assigned] (ARROW-17520) [C++] Implement SubStrait SetRel (UnionAll)

     [ https://issues.apache.org/jira/browse/ARROW-17520?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vibhatha Lakmal Abeykoon reassigned ARROW-17520:
------------------------------------------------

    Assignee: Vibhatha Lakmal Abeykoon

> [C++] Implement SubStrait SetRel (UnionAll)
> -------------------------------------------
>
>                 Key: ARROW-17520
>                 URL: https://issues.apache.org/jira/browse/ARROW-17520
>             Project: Apache Arrow
>          Issue Type: New Feature
>            Reporter: Donghe Kang
>            Assignee: Vibhatha Lakmal Abeykoon
>            Priority: Major
>
> The SetRel operator in Substrait is a critical operator to merge data from several branches in the query plan. The operator has a few options like MINUS, INTERSECTION and UNION. The UNIONALL option that directly merges data flows is the foundation of other options and is easier to implement. As I know, Acero already has the union operator and we could easily map the UNIONALL in Substrait to the Union operator in Acero.



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