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From "Rajesh Balamohan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-15405) Improve FileUtils.isPathWithinSubtree
Date Fri, 09 Dec 2016 08:57:58 GMT
Rajesh Balamohan created HIVE-15405:
---------------------------------------

             Summary: Improve FileUtils.isPathWithinSubtree
                 Key: HIVE-15405
                 URL: https://issues.apache.org/jira/browse/HIVE-15405
             Project: Hive
          Issue Type: Improvement
            Reporter: Rajesh Balamohan
            Priority: Minor


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 do early exit in {{FileUtils.isPathWithinSubtree}}



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