Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/11980#discussion_r57546554 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects.scala --- @@ -109,9 +109,9 @@ case class Invoke( targetObject: Expression, functionName: String, dataType: DataType, - arguments: Seq[Expression] = Nil) extends Expression with NonSQLExpression { + arguments: Seq[Expression] = Nil, + val nullable: Boolean = true) extends Expression with NonSQLExpression { --- End diff -- This looks tricky to me, invoking a method on an object should be always nullable, as we have no idea what that method does. To fix the nullability lose issue, how about we create a new expression called `GetExternalRowField`? We can setup corrected nullability there and generate simpler code for this case.
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