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Posted to issues@drill.apache.org by "Arina Ielchiieva (Jira)" <ji...@apache.org> on 2019/11/04 12:55:00 UTC

[jira] [Updated] (DRILL-6758) Hash Join should not return the join columns when they are not needed downstream

     [ https://issues.apache.org/jira/browse/DRILL-6758?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arina Ielchiieva updated DRILL-6758:
------------------------------------
    Fix Version/s:     (was: 1.17.0)

> Hash Join should not return the join columns when they are not needed downstream
> --------------------------------------------------------------------------------
>
>                 Key: DRILL-6758
>                 URL: https://issues.apache.org/jira/browse/DRILL-6758
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Execution - Relational Operators, Query Planning &amp; Optimization
>    Affects Versions: 1.14.0
>            Reporter: Boaz Ben-Zvi
>            Assignee: Hanumath Rao Maduri
>            Priority: Minor
>
> Currently the Hash-Join operator returns all its (both sides) incoming columns. In cases where the join columns are not used further downstream, this is a waste (allocating vectors, copying each value, etc).
>   Suggestion: Have the planner pass this information to the Hash-Join operator, to enable skipping the return of these columns.
>  



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