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Posted to issues@drill.apache.org by "Sorabh Hamirwasia (JIRA)" <ji...@apache.org> on 2019/02/27 00:17:00 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 ]
Sorabh Hamirwasia updated DRILL-6758:
-------------------------------------
Fix Version/s: (was: 1.16.0)
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 & Optimization
> Affects Versions: 1.14.0
> Reporter: Boaz Ben-Zvi
> Assignee: Hanumath Rao Maduri
> Priority: Minor
> Fix For: 1.17.0
>
>
> 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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