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https://issues.apache.org/jira/browse/DRILL-4857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15433771#comment-15433771
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ASF GitHub Bot commented on DRILL-4857:
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Github user jinfengni commented on the issue:
https://github.com/apache/drill/pull/575
+1
LGTM.
> When no partition pruning occurs with metadata caching there's a performance
> regression
> ---------------------------------------------------------------------------------------
>
> Key: DRILL-4857
> URL: https://issues.apache.org/jira/browse/DRILL-4857
> Project: Apache Drill
> Issue Type: Bug
> Components: Metadata, Query Planning & Optimization
> Affects Versions: 1.7.0
> Reporter: Aman Sinha
> Assignee: Aman Sinha
> Fix For: 1.8.0
>
>
> After DRILL-4530, we see the (expected) performance improvements in planning
> time with metadata cache for cases where partition pruning got applied.
> However, in cases where it did not get applied and for sufficiently large
> number of files (tested with up to 400K files), there's performance
> regression. Part of this was addressed by DRILL-4846. This JIRA is to
> track some remaining fixes to address the regression.
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