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From "Edward Yoon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-2021) Sort Join Implementation
Date Tue, 23 Oct 2007 08:10:50 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2021?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Edward Yoon updated HADOOP-2021:
--------------------------------

    Description: If we don't have an index for a domain in the join, we can still improve
on the nested-loop join using sort join.  (was:  * stands for the usual comparison operators
'<','<=', '>', '>=',  '!=', '='
 * comparing terms in the Q clauses can be arbitrarily connected with boolean operators AND,
NOT, OR


{code}
ex. (a.value = b.value and a.key != b.key)
{code})

> Sort Join Implementation
> ------------------------
>
>                 Key: HADOOP-2021
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2021
>             Project: Hadoop
>          Issue Type: Sub-task
>          Components: contrib/hbase
>    Affects Versions: 0.14.1
>         Environment: all environments  
>            Reporter: Edward Yoon
>            Priority: Minor
>             Fix For: 0.16.0
>
>
> If we don't have an index for a domain in the join, we can still improve on the nested-loop
join using sort join.

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