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https://issues.apache.org/jira/browse/DRILL-3887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14940803#comment-14940803
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Steven Phillips commented on DRILL-3887:
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It was a detail in the code that I missed.
I added the field "usedCache", which will show up in the physical plan. There
is a unit test that tests this, and this can also be used by qa for functional
testing.
> Parquet metadata cache not being used
> -------------------------------------
>
> Key: DRILL-3887
> URL: https://issues.apache.org/jira/browse/DRILL-3887
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Steven Phillips
> Assignee: Steven Phillips
> Priority: Critical
>
> The fix for DRILL-3788 causes a directory to be expanded to its list of files
> early in the query, and this change causes the ParquetGroupScan to no longer
> use the parquet metadata file, even when it is there.
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