Github user yinxusen commented on the pull request:

    https://github.com/apache/spark/pull/11486#issuecomment-197193976
  
    @mengxr One more thing, could you take a look at 
https://issues.apache.org/jira/browse/SPARK-13641? If we extract feature names 
from the RFormulaModel transformed data, the for categorical data, we can only 
extract transformed feature names like I said in that JIRA. Do you think it's 
OK to extract those names?


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