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https://issues.apache.org/jira/browse/DRILL-3838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14934300#comment-14934300
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Stefán Baxter commented on DRILL-3838:
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yeah, they have indexes
> Ability to use UDFs in the directory pruning process
> ----------------------------------------------------
>
> Key: DRILL-3838
> URL: https://issues.apache.org/jira/browse/DRILL-3838
> Project: Apache Drill
> Issue Type: New Feature
> Components: Query Planning & Optimization
> Affects Versions: 1.2.0
> Reporter: Stefán Baxter
>
> This feature request is about allowing UDFs to participate in the
> Directory/Partition pruning process at runtime rather than at
> planing/optimization time.
> For this a UDF needs:
> - filename
> - full path (not just dirN)
> - to be able to throw a IgnoreFile exception
> - to be able to throw a IgnoreDirecotyr exception
> I think the naming is pretty self explanatory and hopefully this brief
> description is enough.
> _Stefan
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