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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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Matthias Boehm closed SYSTEMML-1721.
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> 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 1.0
>
>
> 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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