Github user erikerlandson commented on the pull request:
https://github.com/apache/spark/pull/1351#issuecomment-53114872
@falaki the reading of the CSV header might be made lazy, using something
similar to:
http://erikerlandson.github.io/blog/2014/07/29/deferring-spark-actions-to-lazy-transforms-with-the-promise-rdd/
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