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From "Yongqiang He (JIRA)" <>
Subject [jira] Updated: (HIVE-560) column pruning not working with map joins
Date Wed, 24 Jun 2009 09:15:07 GMT


Yongqiang He updated HIVE-560:

    Attachment: hive-560-2009-06-24-normal(mapjoin-after-column-pruning).patch

Modifed the code to let column pruning be independ with map join conversion. 
hive-560-2009-06-24-mapjoin-before-column-pruning.patch and hive-560-2009-06-24-normal(mapjoin-after-column-pruning).patch
share the same set of modifications.
They both passed tests in my local.

hive-560-2009-06-24-mapjoin-before-column-pruning.patch is not created against truck. And
in it, map join conversion is done before column prune started( by reordering them in optimizer).

hive-560-2009-06-24-normal(mapjoin-after-column-pruning).patch is the one we needed and i
retest and patched with truck code.

> 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

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