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