Mister-Meeseeks commented on issue #23830: [SPARK-26935][SQL]Skip DataFrameReader's CSV first line scan when not used URL: https://github.com/apache/spark/pull/23830#issuecomment-466099210 Added a comment explaining the downstream logic inside `DataFrameReader` I think it adequately documents the thought-process, and makes the PR ready to merge for now. If you still think it's a good idea to address the underlying approach to how the CSV class complex coordinates the collection of the first line, I can make a new PR. Either with something like the `CSVHeaderBox` approach from the above comment, or any sort of alternative which you guys think might be better. Thanks!
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