Matthias Boehm created SYSTEMML-1269:
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             Summary: Performance sparse matrix collect
                 Key: SYSTEMML-1269
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1269
             Project: SystemML
          Issue Type: Sub-task
            Reporter: Matthias Boehm


In case of sparse matrices, our RDD collect functionality exhibits unnecessary 
overhead for (1) repeated sparse row allocations (due to missing exploitation 
of the number of non-zeros which affects the growth rate), and (2) deep copies 
of sparse rows (even in cases like a single column block, where this is not 
required).



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