cloud-fan commented on issue #23829: [SPARK-26915][SQL]File source should write without schema validation in DataFrameWriter.save() URL: https://github.com/apache/spark/pull/23829#issuecomment-464745436 I think this is the case where the file source has unexpected behavior of SaveMode: for append and overwrite mode, spark expects the table already exists, but file source doesn't follow. @rdblue are you ok with special-case file source? I'm a little worried about changing the behavior of file source in Spark 3.0.
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