gengliangwang edited a comment on issue #23836: [SPARK-26915][SQL] DataFrameWriter.save() should write without schema validation URL: https://github.com/apache/spark/pull/23836#issuecomment-465428121 @rdblue Sorry if I cause some misunderstanding. Let's focus on the API `DataFrameWriter.save` here: 1. The expressions `AppendData` and `OverwriteByExpression` always get table schema and validate the output schema with table schema. This is a serious behavior change. Before we have a final agreement about file source V2 behavior(mostly likely we will keep the V1 behavior in this API), I would suggest to revert them for now. 2. This PR is not proposing to keep `SupportsSaveMode` or to say this is the final solution. I am suggesting that we should keep file source behavior in this API, unless there is a clear solution that eventually the following partial development will work. The above solution of @cloud-fan is good directions to go. We can discuss the solution in tomorrow's meetup. For the code changes in `DataFrameWriter.save`, I think we should remove the new expressions for now.
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