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https://issues.apache.org/jira/browse/SYSTEMML-2226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16425054#comment-16425054
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Govinda Malavipathirana commented on SYSTEMML-2226:
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Hi [~mboehm7]
I would like to contribute on this one.
> Add support for colIndexMin/colIndexMax
> ---------------------------------------
>
> Key: SYSTEMML-2226
> URL: https://issues.apache.org/jira/browse/SYSTEMML-2226
> Project: SystemML
> Issue Type: Task
> Reporter: Matthias Boehm
> Priority: Major
>
> SystemML already support {{rowIndexMin}} and {{rowIndexMax}} in the unary
> aggregate framework, but in contrast to all other unary aggregates not its
> column-wise operations. Hence, users are forced to specify and execute
> unnecessary transpose operations.
> This task aims to resolve this by adding the support for {{colIndexMin}} and
> {{colIndexMax}}. In detail, this entails (1) adding new tests for these
> aggregates, (2) extending the language layer by this new builtin function,
> (3) extending the hop and lop compilation, and (4) adding the necessary
> runtime support.
> In separate PRs we further can introduce additional rewrites to remove
> unnecessary operations in existing scripts.
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