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From "Jesus Camacho Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-21399) Adjust hive.map.aggr.hash.min.reduction statically depending on group by statistics
Date Wed, 06 Mar 2019 23:38:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-21399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jesus Camacho Rodriguez updated HIVE-21399:
-------------------------------------------
    Attachment: HIVE-21399.01.patch

> Adjust hive.map.aggr.hash.min.reduction statically depending on group by statistics
> -----------------------------------------------------------------------------------
>
>                 Key: HIVE-21399
>                 URL: https://issues.apache.org/jira/browse/HIVE-21399
>             Project: Hive
>          Issue Type: Improvement
>          Components: Hive
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>         Attachments: HIVE-21399.01.patch
>
>
> Currently, the value is set statically from config variable. If stats are available,
we could try to adjust this value at optimization time to favor turning off hash aggregation
earlier.



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