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https://issues.apache.org/jira/browse/SYSTEMML-906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15488963#comment-15488963
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Deron Eriksson commented on SYSTEMML-906:
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I'll take a look at this.
> Use of `df.first` in MLContextUtil is a Bottleneck
> --------------------------------------------------
>
> Key: SYSTEMML-906
> URL: https://issues.apache.org/jira/browse/SYSTEMML-906
> Project: SystemML
> Issue Type: Improvement
> Reporter: Mike Dusenberry
>
> The use of {{dataframe.first()}} at {{MLContextUtil.java:497}} 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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