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https://issues.apache.org/jira/browse/SPARK-14659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15243642#comment-15243642
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Joseph K. Bradley commented on SPARK-14659:
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This change SGTM. I'll target it for 2.0
> OneHotEncoder support drop first category alphabetically in the encoded
> vector
> -------------------------------------------------------------------------------
>
> Key: SPARK-14659
> URL: https://issues.apache.org/jira/browse/SPARK-14659
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Reporter: Yanbo Liang
>
> R formula drop the first category alphabetically when encode string/category
> feature. Spark RFormula use OneHotEncoder to encode string/category feature
> into vector, but only supporting "dropLast" by string/category frequencies.
> This will cause SparkR produce different models compared with native R.
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