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https://issues.apache.org/jira/browse/DRILL-4287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15128751#comment-15128751
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ASF GitHub Bot commented on DRILL-4287:
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Github user jinfengni commented on the pull request:
https://github.com/apache/drill/pull/345#issuecomment-178746517
Overall, looks good to me.
+1
> Do lazy reading of parquet metadata cache file
> ----------------------------------------------
>
> Key: DRILL-4287
> URL: https://issues.apache.org/jira/browse/DRILL-4287
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Affects Versions: 1.4.0
> Reporter: Aman Sinha
> Assignee: Jinfeng Ni
>
> Currently, the parquet metadata cache file is read eagerly during creation of
> the DrillTable (as part of ParquetFormatMatcher.isReadable()). This is not
> desirable from performance standpoint since there are scenarios where we want
> to do some up-front optimizations - e.g. directory-based partition pruning
> (see DRILL-2517) or potential limit 0 optimization etc. - and in such
> situations it is better to do lazy reading of the metadata cache file.
> This is a placeholder to perform such delayed reading since it is needed for
> the aforementioned optimizations.
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