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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SYSTEMML-2369) Incorrect nnz runtime propagation on codegen spark cell ops w/o agg
Date Thu, 07 Jun 2018 04:01:00 GMT
Matthias Boehm created SYSTEMML-2369:
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             Summary: Incorrect nnz runtime propagation on codegen spark cell ops w/o agg
                 Key: SYSTEMML-2369
                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2369
             Project: SystemML
          Issue Type: Bug
            Reporter: Matthias Boehm


The recent codegen compiler modification in SYSTEMML-2134 revealed a hidden issue where spark
codegen cell operations without aggregation wrongly propagated the number of non-zeros of
the main input into the output. This can lead to incorrect results if the main input is empty
but the cell operation is sparse-unsafe.



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