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Posted to issues@drill.apache.org by "James Turton (Jira)" <ji...@apache.org> on 2023/02/08 09:11:00 UTC

[jira] [Closed] (DRILL-8290) Early exit from recursive file listing for LIMIT 0 queries

     [ https://issues.apache.org/jira/browse/DRILL-8290?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

James Turton closed DRILL-8290.
-------------------------------
    Resolution: Fixed

> Early exit from recursive file listing for LIMIT 0 queries
> ----------------------------------------------------------
>
>                 Key: DRILL-8290
>                 URL: https://issues.apache.org/jira/browse/DRILL-8290
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Query Planning &amp; Optimization
>    Affects Versions: 1.20.2
>            Reporter: James Turton
>            Assignee: James Turton
>            Priority: Minor
>             Fix For: 1.21.0
>
>
> The existing LIMIT 0 query optimisations do not prevent a query run against the top of a deep DFS directory tree from recursively listing FileStatuses for everything within it using a pool of worker threads. This Issue proposes a new optimisation whereby such queries will recurse into the directory tree on a single thread that returns as soon as any single FileStatus has been obtained.



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