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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (SYSTEMML-2007) New order with multiple order-by columns
Date Thu, 30 Nov 2017 21:55:00 GMT

     [ https://issues.apache.org/jira/browse/SYSTEMML-2007?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matthias Boehm closed SYSTEMML-2007.
------------------------------------
       Resolution: Done
         Assignee: Matthias Boehm
    Fix Version/s: SystemML 1.0

> New order with multiple order-by columns
> ----------------------------------------
>
>                 Key: SYSTEMML-2007
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2007
>             Project: SystemML
>          Issue Type: Task
>            Reporter: Matthias Boehm
>            Assignee: Matthias Boehm
>             Fix For: SystemML 1.0
>
>
> There are multiple use cases, where users have to emulate an order with multiple order-by
columns as follows (which works due to stable sort):
> {code}
> X = order(target=X, by=3, ...)
> X = order(target=X, by=2, ...)
> X = order(target=X, by=1, ...)
> {code}
> This causes unnecessary overhead by sorting the dataset in the number of order-by columns.
Hence, this task aims to support an order function that allows both scalar and matrix {{by}}
parameters.



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