hive-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Prasanth Jayachandran (JIRA)" <>
Subject [jira] [Updated] (HIVE-15771) CBO chooses wrong join order for TPC-DS query72
Date Tue, 31 Jan 2017 23:13:51 GMT


Prasanth Jayachandran updated HIVE-15771:
    Attachment: query72.sql

> CBO chooses wrong join order for TPC-DS query72
> -----------------------------------------------
>                 Key: HIVE-15771
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>          Components: CBO
>    Affects Versions: 2.2.0
>            Reporter: Prasanth Jayachandran
>            Priority: Critical
>         Attachments: q72-explain.txt, q72-mod-explain.txt, q72-mod.svg, q72.svg, query72-mod.sql,
> Query72 of TPC-DS on 1TB scale generates wrong join order resulting in increased query
execution time. It chooses fact-to-fact table join followed by joins with dimension tables
as opposed to doing map-join with dimension tables first and doing the fact-to-fact table
join at the last.
> Please find attachment for the join order selected by CBO vs rewritten query with correct
join order. 

This message was sent by Atlassian JIRA

View raw message