Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/19662#discussion_r149331633 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala --- @@ -75,6 +75,7 @@ abstract class Expression extends TreeNode[Expression] { * - it relies on some mutable internal state, or * - it relies on some implicit input that is not part of the children expression list. * - it has non-deterministic child or children. + * - it is an UDF that can cause runtime exception on some specific input. --- End diff -- Ok.
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