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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SYSTEMML-1444) UDFs w/ single output in expressions
Date Tue, 25 Jul 2017 09:30:01 GMT

    [ https://issues.apache.org/jira/browse/SYSTEMML-1444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16099769#comment-16099769
] 

Matthias Boehm commented on SYSTEMML-1444:
------------------------------------------

thanks again for taking this over [~return_01]. There are three different integration approaches
(1) split expressions at parser/language level, (2) special handling of functions with a single
output (but leave the current multi-output handling unchanged), and (3) full multi-output
integration of functions into the HOP/LOP compiler (which requires quite involved modifications
from the language all the way down to the instruction generation). 

While writing up the steps for (3), I came to the conclusion that its integration complexity
might not be justified. Hence, I'm currently in favor of (2) which would be rather straight-forward,
achieve the goals, and allow us to later extend this to (3). I'd like to think a little more
about the implications. Once we settled on the general approach, I'll help to define the individual
subtasks. 

> UDFs w/ single output in expressions
> ------------------------------------
>
>                 Key: SYSTEMML-1444
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1444
>             Project: SystemML
>          Issue Type: Sub-task
>          Components: APIs, Compiler, Runtime
>            Reporter: Matthias Boehm
>            Assignee: Janardhan
>             Fix For: SystemML 1.0
>
>




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