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Posted to issues@systemml.apache.org by "Deron Eriksson (JIRA)" <ji...@apache.org> on 2016/09/14 00:48:20 UTC

[jira] [Assigned] (SYSTEMML-907) Use of `df.first` in MLContextConversionUtil is a Bottleneck

     [ https://issues.apache.org/jira/browse/SYSTEMML-907?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Deron Eriksson reassigned SYSTEMML-907:
---------------------------------------

    Assignee: Deron Eriksson

> Use of `df.first` in MLContextConversionUtil is a Bottleneck
> ------------------------------------------------------------
>
>                 Key: SYSTEMML-907
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-907
>             Project: SystemML
>          Issue Type: Improvement
>            Reporter: Mike Dusenberry
>            Assignee: Deron Eriksson
>
> The use of {{dataframe.first()}} at {{MLContextConversionUtil.java:514}} causes a severe bottleneck if the input DataFrame is a lazy result of a compute-intensive chain.  We should change this to use {{dataframe.schema}}, and then iterate over the types in the schema.
> cc [~deron]



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