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From "Yongqiang He (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-560) column pruning not working with map joins
Date Thu, 25 Jun 2009 02:25:07 GMT

     [ https://issues.apache.org/jira/browse/HIVE-560?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Yongqiang He updated HIVE-560:

    Attachment: hive-560-2009-06-25.patch

Upload a new patch integrating with Namit's comments (Thanks Namit).
Since the modification is not major comparing to the previous one, I test the new patch with
a full test of test parse, but only a subset of test cli driver testcases (only queries with
join*.q are tested).

> column pruning not working with map joins
> -----------------------------------------
>                 Key: HIVE-560
>                 URL: https://issues.apache.org/jira/browse/HIVE-560
>             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,
hive-560-2009-06-24-normal(mapjoin-after-column-pruning).patch, hive-560-2009-06-25.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

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