gengliangwang opened a new pull request #24203: [SPARK-27269][SQL] File source v2 should validate data schema only URL: https://github.com/apache/spark/pull/24203 ## What changes were proposed in this pull request? Currently, File source v2 allows each data source to specify the supported data types by implementing the method `supportsDataType` in `FileScan` and `FileWriteBuilder`. However, in the read path, the validation checks all the data types in `readSchema`, which might contain partition columns. This is actually a regression. E.g. Text data source only supports String data type, while the partition columns can still contain Integer type since partition columns are processed by Spark. This PR is to: 1. Refactor schema validation and check data schema only. 2. Filter the partition columns in data schema if user specified schema provided. ## How was this patch tested? Unit test
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