cloud-fan commented on issue #23714: [SPARK-26744][SQL]Support schema validation in FileDataSourceV2 framework URL: https://github.com/apache/spark/pull/23714#issuecomment-462225364 @rdblue @gengliangwang I don't think this needs an API change. This is just a schema validation feature, which can be done in any DS v2 sources. Schema validation needs to know the user-specified schema when reading, or the schema of input data when writing, which are both available in the current ds v2 APIs. It looks to me this PR just re-implements the schema validation feature in file source v2 framework.
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