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https://issues.apache.org/jira/browse/SPARK-12942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-12942.
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Resolution: Incomplete
> Provide option to allow control the precision of numerical type for
> DataFrameWriter
> -----------------------------------------------------------------------------------
>
> Key: SPARK-12942
> URL: https://issues.apache.org/jira/browse/SPARK-12942
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Jeff Zhang
> Priority: Major
> Labels: bulk-closed
>
> This is useful for libsvm where most of features are double, and this can
> reduce the file size and gain some performance improvement when reading the
> libsvm file in training.
> So it can be libsvm specific or global setting which apply to other data
> sources. We can discuss it here. \cc [~mengxr]
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