Github user MaxGekk commented on the issue:
https://github.com/apache/spark/pull/20894
Actually the `spark.sql.caseSensitive` flag is checked during schema
inferring :
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVDataSource.scala#L162
I think we have to respect it when we check header against inferred schema
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