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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SYSTEMML-2226) Add support for colIndexMin/colIndexMax
Date Tue, 03 Apr 2018 04:42:00 GMT
Matthias Boehm created SYSTEMML-2226:
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             Summary: Add support for colIndexMin/colIndexMax
                 Key: SYSTEMML-2226
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2226
             Project: SystemML
          Issue Type: Sub-task
            Reporter: Matthias Boehm


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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