Mike Dusenberry created SYSTEMML-906:
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Summary: Use of `df.first` in MLContext 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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