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https://issues.apache.org/jira/browse/DRILL-4849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15424170#comment-15424170
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Miroslav Holubec commented on DRILL-4849:
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patch on branch including DRILL-4601:
https://github.com/myroch/drill/commit/14c499ab74538f618952b0578a72b9f23785fe5d
m.
> Refresh table metadata performance: read only new/updated parquet files
> -----------------------------------------------------------------------
>
> Key: DRILL-4849
> URL: https://issues.apache.org/jira/browse/DRILL-4849
> Project: Apache Drill
> Issue Type: Improvement
> Components: Query Planning & Optimization
> Affects Versions: 1.7.0
> Reporter: Miroslav Holubec
> Labels: metadata, parquet, performance, planning
>
> Currently REFRESH TABLE METADATA takes serious amount of time for many small
> parquet files. We can actually only read these parquets, which are new or
> changed. This will require to add modificationTime into file metadata.
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