How to replace the DataField values with exact column names in Spark-MLlib PMML file?

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I use Spark 2.1.0.

I've been trying to export Spark-MLlib Linear Regression model as PMML file. I've also successfully exported the PMML file. But in that file, I couldn't see any field name in it. All I can see is like this,

enter image description here

Can anyone let me know what's the reason for this? Also, please let me know how to obtain the column names in place of that.

pmml apache-spark-mllib apache-spark linear-regression machine-learning
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