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From "Anil Gupta (JIRA)" <j...@apache.org>
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)
Date Wed, 02 Jan 2013 09:56:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13542069#comment-13542069
] 

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

[~andrew.purtell@gmail.com]
My implementation is not at all related to HBase-4435. It seems like goal of HBase-4435  is
quite different from mine.

[~lhofhansl]
Yes, if the scan spans multiple regions then i do a merge sort at the Client side. Otherwise,
if the scan is limited to a single region then i dont need to perform a merge sort. So, in
the latter it's slightly  optimized. I've attached the high level flowchart for reference.

Thanks,
Anil Gupta
Software Engineer II, Intuit, inc
                
> 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: 0.94.4
>
>         Attachments: 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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