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From "Rajesh Balamohan (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-15339) Batch metastore calls to get column stats for fields needed in FilterSelectivityEstimator
Date Fri, 16 Dec 2016 10:46:58 GMT

     [ https://issues.apache.org/jira/browse/HIVE-15339?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rajesh Balamohan reassigned HIVE-15339:
---------------------------------------

    Assignee: Rajesh Balamohan

> Batch metastore calls to get column stats for fields needed in FilterSelectivityEstimator
> -----------------------------------------------------------------------------------------
>
>                 Key: HIVE-15339
>                 URL: https://issues.apache.org/jira/browse/HIVE-15339
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Rajesh Balamohan
>            Assignee: Rajesh Balamohan
>            Priority: Minor
>         Attachments: HIVE-15339.1.patch, HIVE-15339.3.patch, HIVE-15339.4.patch, HIVE-15339.5.patch
>
>
> Based on query pattern, {{FilterSelectivityEstimator}} gets column statistics from metastore
in multiple calls. For instance, in the following query, it ends up getting individual column
statistics for for flights multiple number of times.
> When the table has large number of partitions, getting statistics for columns via multiple
calls can be very expensive. This would adversely impact the overall compilation time. The
following query took 14 seconds to compile.
> {noformat}
> SELECT COUNT(`flights`.`flightnum`) AS `cnt_flightnum_ok`,
> YEAR(`flights`.`dateofflight`) AS `yr_flightdate_ok`
> FROM `flights` as `flights`
> JOIN `airlines` ON (`flights`.`uniquecarrier` = `airlines`.`code`)
> JOIN `airports` as `source_airport` ON (`flights`.`origin` = `source_airport`.`iata`)
> JOIN `airports` as `dest_airport` ON (`flights`.`dest` = `dest_airport`.`iata`)
> GROUP BY YEAR(`flights`.`dateofflight`);
> {noformat}
> It may be helpful to club all columns that need statistics and fetch these details in
single remote call.



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