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Posted to issues@systemml.apache.org by "Mike Dusenberry (JIRA)" <ji...@apache.org> on 2016/09/11 00:38:20 UTC
[jira] [Created] (SYSTEMML-907) Use of `df.first` in
MLContextConversionUtil is a Bottleneck
Mike Dusenberry created SYSTEMML-907:
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Summary: 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
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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