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https://issues.apache.org/jira/browse/SYSTEMML-1721?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Glenn Weidner updated SYSTEMML-1721:
------------------------------------
    Fix Version/s:     (was: SystemML 1.0)
                   SystemML 0.15

> Invalid cplan reuse from plan cache 
> ------------------------------------
>
>                 Key: SYSTEMML-1721
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1721
>             Project: SystemML
>          Issue Type: Bug
>            Reporter: Matthias Boehm
>            Assignee: Matthias Boehm
>             Fix For: SystemML 0.15
>
>
> Cplans (code generation plans) are hashed and compared in order to reuse 
> compiled classes in the context of the existing plan cache. In order to 
> increase reuse potential, this comparison does not include leaf not names or 
> IDs but their data types and the entire operation DAG on top. However, this 
> leads to invalid reuse for patterns such {{(c1+c3)*(c2+c3)}} and 
> {{(c1+c2)*(c3+c3)}}, which are assumed to be equivalent but compute very 
> different results.
> This task aims to fix this for the general case and introduce a dedicated 
> test suite to ensure proper comparison.



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