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https://issues.apache.org/jira/browse/SYSTEMML-1459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-1459.
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> Wrong codegen materialization decisions due to dangling hop parents
> -------------------------------------------------------------------
>
> Key: SYSTEMML-1459
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1459
> Project: SystemML
> Issue Type: Bug
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Fix For: SystemML 1.0
>
>
> The cost-based codegen plan selector uses hops with multiple consumers as
> candidates for decisions on materalization points. On end-to-end algorithm
> scenarios, we encountered side effects from specific dynamic simplification
> rewrites which did not properly cleanup parent-child pointers of removed hops.
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