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From "Vineet Garg (Jira)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-22591) Make single metastore call to fetch all column stats instead of separate call for each column
Date Fri, 06 Dec 2019 10:44:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-22591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vineet Garg updated HIVE-22591:
-------------------------------
    Status: Patch Available  (was: Open)

> Make single metastore call to fetch all column stats instead of separate call for each
column
> ---------------------------------------------------------------------------------------------
>
>                 Key: HIVE-22591
>                 URL: https://issues.apache.org/jira/browse/HIVE-22591
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Planning
>            Reporter: Vineet Garg
>            Assignee: Vineet Garg
>            Priority: Major
>         Attachments: HIVE-22591.1.patch
>
>
> Currently HiveRelFieldTrimmer has the ability to fetch (and trigger cache) column stats
in single call. 
> HiveReduceExpressionsWithStatsRule on the other hand has to use column stats on demand,
as a result it makes single call for each column.
> This should be moved after RelFieldTrimmer so that RelFieldTrimmer has all the column
stats cached.



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