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Posted to issues@calcite.apache.org by "Ruben Q L (Jira)" <ji...@apache.org> on 2019/12/05 08:15:00 UTC

[jira] [Resolved] (CALCITE-3546) Improve EnumerableDefaults nested loop join

     [ https://issues.apache.org/jira/browse/CALCITE-3546?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ruben Q L resolved CALCITE-3546.
--------------------------------
    Resolution: Fixed

> Improve EnumerableDefaults nested loop join
> -------------------------------------------
>
>                 Key: CALCITE-3546
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3546
>             Project: Calcite
>          Issue Type: Improvement
>    Affects Versions: 1.21.0
>            Reporter: Ruben Q L
>            Assignee: Ruben Q L
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 1.22.0
>
>          Time Spent: 4h
>  Remaining Estimate: 0h
>
> The current implementation of {{EnumerableDefaults#nestedLoopJoin}} builds the complete join result in a list before returning it. As specified in a comment there, this is "easy, but hogs memory". Also, it is not very efficient if after the join there is a LIMIT.
> An alternative implementation of nested loop join can be proposed, based on iterating through the outer an inner enumerables, and returning the results step by step (something similar to {{EnumerableDefaults#correlateJoin}}).



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