Ngone51 commented on issue #23651: [SPARK-26730][SQL] Strip redundant AssertNotNull for ExpressionEncoder's serializer URL: https://github.com/apache/spark/pull/23651#issuecomment-459397164 > Why? We'll still add `AssertNotNull` for the input(`BoundReference`) when we do null safe transform for it: ``` val nullSafeSerializer = objSerializer.transformUp { case r: BoundReference => // For input object of Product type, we can't encode it to row if it's null, as Spark SQL // doesn't allow top-level row to be null, only its columns can be null. AssertNotNull(r, Seq("top level Product or row object")) } ```
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