hive-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Yongqiang He (JIRA)" <>
Subject [jira] Commented: (HIVE-560) column pruning not working with map joins
Date Thu, 25 Jun 2009 01:29:07 GMT


Yongqiang He commented on HIVE-560:

>>it might be a good idea not to use removedList at runtime, but create the correct
list from removedList at compile time itself.
you mean what we should use is a retain list instead of a remove list?

> column pruning not working with map joins
> -----------------------------------------
>                 Key: HIVE-560
>                 URL:
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.4.0
>            Reporter: Namit Jain
>            Assignee: Yongqiang He
>         Attachments: hive-560-2009-06-19-2.patch, hive-560-2009-06-19-5.patch, hive-560-2009-06-24-mapjoin-before-column-pruning.patch,
> drop table tst1;
> drop table tst2;
> create table tst1(a1 string, a2 string, a3 string, a4 string);
> create table tst2(b1 string, b2 string, b3 string, b4 string);
> explain select /*+ MAPJOIN(a) */ a.a1, a.a2 from tst1 a join tst2 b ON a.a2=b.b2;
> the select is after the join - column pruning is not happening

This message is automatically generated by JIRA.
You can reply to this email to add a comment to the issue online.

View raw message