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From mayunSaicmotor <>
Subject [GitHub] incubator-carbondata pull request #732: [CARBONDATA-754] improve performance...
Date Wed, 05 Apr 2017 12:01:20 GMT
GitHub user mayunSaicmotor reopened a pull request:

    [CARBONDATA-754] improve performance when order by prefix columns of mdk  + limit

    the improvement scenario  is for  order by prefix columns of mdk  + limit
    the logical is to leverage  the mdk sort feature to get the sorted data. The performance
is much better.
    for example,  order by prefix columns of mdk  + limit on 20,000,000 data, the  performance
can be from  10s to about 1s.
    if do not want to use this feature, can also set    CarbonCommonConstants.ORDER_BY_MDK_OPTIMIZATION_FLG
= false.

You can merge this pull request into a Git repository by running:

    $ git pull orderby-mdk

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #732
commit 8a623995a9c9385223be740c56ecb6c9b1dfb38d
Author: 马云 <>
Date:   2017-03-31T14:07:35Z

    Merge pull request #5 from apache/master
    merge from master

commit 9294f5c2b77052f44272e43a432182b9c0b84643
Author: mayun <>
Date:   2017-04-02T03:28:16Z

    order by mdk optimization

commit 33ed5d7e20bdefc085411137a2263fd6bbf87a1d
Author: mayun <>
Date:   2017-04-05T05:51:53Z

    order by mdk optimization

commit 1af457b517c0ed26f3ee80e8235f16625f03134f
Author: 马云 <>
Date:   2017-04-05T08:45:56Z

    Merge pull request #6 from apache/master
    merge from apache master

commit f73495fab356e52676200e69fe299fd61806777d
Author: mayun <>
Date:   2017-04-05T09:35:51Z

    add test data

commit 8c7a190be441937739bc8ea331954c1ffb4e8160
Author: mayun <>
Date:   2017-04-05T09:37:41Z

    add load test data class

commit fcbc4b6233bd0d55eaa9d81bf14fa9f96f6c1653
Author: mayun <>
Date:   2017-04-05T11:58:08Z

    change limit default value from 0 to -1


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