Matthias Boehm created SYSTEMML-2174:
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             Summary: 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


For spark cpmm instructions with a single output block, we should prune empty 
blocks before the join and before aggregation.



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