[jira] [Assigned] (HIVE-15405) Improve FileUtils.isPathWithinSubtree

["Rajesh Balamohan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-15405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rajesh Balamohan reassigned HIVE-15405:
---------------------------------------

    Assignee: Rajesh Balamohan

> Improve FileUtils.isPathWithinSubtree
> -------------------------------------
>
>                 Key: HIVE-15405
>                 URL: https://issues.apache.org/jira/browse/HIVE-15405
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Rajesh Balamohan
>            Assignee: Rajesh Balamohan
>            Priority: Minor
>         Attachments: HIVE-15405-profiler.view.png, HIVE-15405.1.patch
>
>
> When running single node LLAP with the following query multiple number of times (flights table had 7000+ partitions) {{FileUtils.isPathWithinSubtree}} became a hotpath. 
> {noformat}
> SELECT COUNT(`flightnum`) AS `cnt_flightnum_ok`,
> YEAR(`flights`.`dateofflight`) AS `yr_flightdate_ok`
> FROM `flights` as `flights`
> JOIN `airlines` ON (`uniquecarrier` = `airlines`.`code`)
> JOIN `airports` as `source_airport` ON (`origin` = `source_airport`.`iata`)
> JOIN `airports` as `dest_airport` ON (`flights`.`dest` = `dest_airport`.`iata`)
> GROUP BY YEAR(`flights`.`dateofflight`);
> {noformat}
> It would be good to have early exit in {{FileUtils.isPathWithinSubtree}} based on path depth comparison.



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