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Date: Fri, 4 Jan 2013 07:54:14 +0000 (UTC)
From: "Anil Gupta (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12625635.1357084758725.79153.1357286054220@arcas>
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Subject: [jira] [Commented] (HBASE-7474) Endpoint Implementation to support
 Scans with Sorting of Rows based on column values(similar to "order by"
 clause of RDBMS)
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    [ https://issues.apache.org/jira/browse/HBASE-7474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13543682#comment-13543682 ] 

Anil Gupta commented on HBASE-7474:
-----------------------------------

How to try out the patch?

By default the patch contains an end-end implementation for sorting based on BigDecimal column. In order to support any other datatype you just need to implement SortingColumnInterpreter interface.

Steps required to do sorting:
    1.Instantiate a class which implements SortingColumnInterpreter.
    2.Prepare the scan object
    3.Instantiate the HTable
    4.Instantiate SortingClient
    5.Invoke the method of sorting client.
                
> Endpoint Implementation to support Scans with Sorting of Rows based on column values(similar to "order by" clause of RDBMS)
> ---------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-7474
>                 URL: https://issues.apache.org/jira/browse/HBASE-7474
>             Project: HBase
>          Issue Type: New Feature
>          Components: Coprocessors, Scanners
>    Affects Versions: 0.94.3
>            Reporter: Anil Gupta
>            Priority: Minor
>              Labels: coprocessors, scan, sort
>             Fix For: 0.94.5
>
>         Attachments: hbase-7474.patch, SortingEndpoint_high_level_flowchart.pdf
>
>
> Recently, i have developed an Endpoint which can sort the Results(rows) on the basis of column values. This functionality is similar to "order by" clause of RDBMS. I will be submitting this Patch for HBase0.94.3
> I am almost done with the initial development and testing of feature. But, i need to write the JUnits for this. I will also try to make design doc.
> Thanks,
> Anil Gupta
> Software Engineer II, Intuit, inc

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