Github user maropu commented on the issue: https://github.com/apache/spark/pull/19999 plz update the doc in `DataFrameRaeder` https://github.com/apache/spark/blob/0c8fca4608643ed9e1eb3ae8620e6f4f6a017a87/sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala#L248
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