zsxwing commented on issue #25382: [SPARK-28651][SS]Force streaming file source to be nullable URL: https://github.com/apache/spark/pull/25382#issuecomment-519611520 > ideally we should respect the nullability ... Agreed with this. However, I think making the file source report the correct nullability is hard. It's either be inferred or user specified, which is error-prone. As Spark right now doesn't validate data to make sure nullability is correct, it can lead to weird NPE when processing the bad data, or corrupted files when writing. It would be hard for a Spark user to debug such errors. I don't know why we added this behavior for batch queriers. Ping @liancheng to comment this since he added it in https://github.com/apache/spark/pull/6285/files#diff-3d26956194a9a58c7eca9b364395e0c2R249
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