Github user dongjinleekr commented on the issue:
https://github.com/apache/spark/pull/21501
@mengxr Thank you very much for your kind guidance. If you have some time,
please have a look at my another PR, #21525. I found this issue while I was
reading [an issue on
HashingTF](https://issues.apache.org/jira/browse/SPARK-13998).
@viirya Thank you again for your comments. Without you I could never
complete this feature.
@dongjoon-hyun ð
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