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From "Deron Eriksson (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SYSTEMML-907) Use of `df.first` in MLContextConversionUtil is a Bottleneck
Date Thu, 15 Sep 2016 21:46:20 GMT

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

Deron Eriksson resolved SYSTEMML-907.
-------------------------------------
       Resolution: Fixed
    Fix Version/s: SystemML 0.11

Fixed by [PR242|https://github.com/apache/incubator-systemml/pull/242].

> 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
>             Fix For: SystemML 0.11
>
>
> 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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