Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/8750#issuecomment-140148377
@viirya Thank you for the pr! However, for JSON, I am not sure we should
always write null values because the cost of encoding a null value is high. If
we always writing null values, the cost of storing a sparse column can be very
high. Instead, it will be good to just write null values for the first row
generated by the writer. But, the implementation can be tricky. It will be good
to see if we can have a clean solution at here.
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