[
https://issues.apache.org/jira/browse/DRILL-8290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17598408#comment-17598408
]
ASF GitHub Bot commented on DRILL-8290:
---------------------------------------
jnturton opened a new pull request, #2636:
URL: https://github.com/apache/drill/pull/2636
# [DRILL-8290](https://issues.apache.org/jira/browse/DRILL-8290): Short
circuit recursive file listings for LIMIT 0 queries
## Description
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 PR adds 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.
## Documentation
Mention in the docs on LIMIT 0 optimisations.
## Testing
TODO
> 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 & 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.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
