Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/22785#discussion_r226978705 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/encoders/RowEncoder.scala --- @@ -187,7 +187,7 @@ object RowEncoder { val convertedField = if (field.nullable) { If( Invoke(inputObject, "isNullAt", BooleanType, Literal(index) :: Nil), - Literal.create(null, field.dataType), + Literal.create(null, fieldValue.dataType), --- End diff -- can we add a comment to explain it? `field.dataType` can be different from `fieldValue.dataType`, because we strip UDT
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