hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Edward Yoon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-2003) The boolean expression can be added to the where clause of select statement
Date Sun, 07 Oct 2007 01:11:51 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2003?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Edward Yoon updated HADOOP-2003:
--------------------------------

    Description: 
selects a subset of the rows in a relation that satisfy a selection condition (yet, by only
iterator series-based process)
Result = σ (selection condition)(relation name)

a boolean expression specified on the attributes of a specified relation 
a relation that has the same attributes as the source relation; 

 * stands for the usual comparison operators '<', '<>', '<=', '>', '>=',
etc 
 * clauses can be arbitrarily connected with boolean operators AND, OR, NOT

  was:
selects a subset of the tuples in a relation that satisfy a selection condition 
Result = σ (selection condition)(relation name)

a boolean expression specified on the attributes of a specified relation 
a relation that has the same attributes as the source relation; 

 * stands for the usual comparison operators '<', '<>', '<=', '>', '>=',
etc 
 * clauses can be arbitrarily connected with boolean operators AND, OR, NOT


> The boolean expression can be added to the where clause of select statement
> ---------------------------------------------------------------------------
>
>                 Key: HADOOP-2003
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2003
>             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
>
>
> selects a subset of the rows in a relation that satisfy a selection condition (yet, by
only iterator series-based process)
> Result = σ (selection condition)(relation name)
> a boolean expression specified on the attributes of a specified relation 
> a relation that has the same attributes as the source relation; 
>  * stands for the usual comparison operators '<', '<>', '<=', '>', '>=',
etc 
>  * clauses can be arbitrarily connected with boolean operators AND, OR, NOT

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


Mime
View raw message