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https://issues.apache.org/jira/browse/DRILL-8290?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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James Turton updated DRILL-8290:
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Summary: Early exit from recursive file listing for LIMIT 0 queries (was:
Short cut recursive file listings for LIMIT 0 queries)
> 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 & 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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