hive-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Vineet Garg (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-17308) Improvement in join cardinality estimation
Date Tue, 15 Aug 2017 01:21:02 GMT

     [ https://issues.apache.org/jira/browse/HIVE-17308?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vineet Garg updated HIVE-17308:
-------------------------------
    Status: Patch Available  (was: Open)

> Improvement in join cardinality estimation
> ------------------------------------------
>
>                 Key: HIVE-17308
>                 URL: https://issues.apache.org/jira/browse/HIVE-17308
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Planning
>            Reporter: Vineet Garg
>            Assignee: Vineet Garg
>         Attachments: HIVE-17308.1.patch, HIVE-17308.2.patch, HIVE-17308.3.patch, HIVE-17308.4.patch,
HIVE-17308.5.patch, HIVE-17308.6.patch
>
>
> Currently during logical planning join cardinality is estimated assuming no correlation
among join keys (This estimation is done using exponential backoff). Physical planning on
the other hand consider correlation for multi keys and uses different estimation. We should
consider correlation during logical planning as well.



--
This message was sent by Atlassian JIRA
(v6.4.14#64029)

Mime
View raw message