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Posted to issues@hive.apache.org by "Vineet Garg (Jira)" <ji...@apache.org> on 2019/12/06 10:43:00 UTC

[jira] [Assigned] (HIVE-22591) Make single metastore call to fetch all column stats instead of separate call for each column

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

Vineet Garg reassigned HIVE-22591:
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> 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
>
> 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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