Rajesh Balamohan created HIVE-15405:
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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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