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Posted to issues@drill.apache.org by "James Turton (Jira)" <ji...@apache.org> on 2022/09/01 14:22:00 UTC

[jira] [Updated] (DRILL-8290) Short cut recursive file listings for LIMIT 0 queries

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

James Turton updated DRILL-8290:
--------------------------------
    Summary: Short cut recursive file listings for LIMIT 0 queries  (was: Short circuit recursive file listings for LIMIT 0 queries)

> Short cut recursive file listings 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
>            Priority: Minor
>             Fix For: 2.0.0
>
>
> 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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