rdblue commented on issue #25536: [SPARK-28837][SQL] CTAS/RTAS should use nullable schema URL: https://github.com/apache/spark/pull/25536#issuecomment-523653110 > I've seen many parquet files corrupted with nulls written to non-nullable fields according to Parquet's schema I've not hit this problem. What version of Parquet are you using? Usually, if the Spark plan is wrong about nullability, we get NPEs thrown in codegen sections because of assignment to primitive types. Though that doesn't affect strings and decimals.
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