[
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.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
