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Posted to issues@drill.apache.org by "James Turton (Jira)" <ji...@apache.org> on 2022/08/31 14:24:00 UTC

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

James Turton created DRILL-8290:
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             Summary: Short circuit 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
             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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