Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/22958
For CSV, looks we are already doing so:
https://github.com/apache/spark/blob/76813cfa1e2607ea3b669a79e59b568e96395b2e/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/csvExpressions.scala#L109-L111
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