[ 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)