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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7616) pre-size mapjoin hashtable based on statistics
Date Wed, 06 Aug 2014 01:54:12 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14087106#comment-14087106
] 

Sergey Shelukhin commented on HIVE-7616:
----------------------------------------

also, for joins where many rows come from right side per key, this patch will not be so good
(hashtable will be too big), given the above about number of keys vs number of rows

> pre-size mapjoin hashtable based on statistics
> ----------------------------------------------
>
>                 Key: HIVE-7616
>                 URL: https://issues.apache.org/jira/browse/HIVE-7616
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>         Attachments: HIVE-7616.patch
>
>




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