Github user jpiper commented on the issue:
https://github.com/apache/spark/pull/16578
I've just tested this patch and in my use case I've gone from 2 mins down
to about 6 seconds - absolutely fantastic, great work!
Given the benefits of storing data in nested/complex schema compared to a
giant flat schema, this is a massive boon. I'm hoping someone can give this the
nudge it needs to make it to mainline :) @cloud-fan @ericl @liancheng @rxin
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