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https://issues.apache.org/jira/browse/SYSTEMML-2174?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-2174.
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> Ultra-sparse cpmm empty block pruning
> -------------------------------------
>
>                 Key: SYSTEMML-2174
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2174
>             Project: SystemML
>          Issue Type: Sub-task
>            Reporter: Matthias Boehm
>            Assignee: Matthias Boehm
>            Priority: Major
>             Fix For: SystemML 1.1
>
>
> For spark cpmm instructions with a single output block, we should prune empty 
> blocks before the join and before aggregation.



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