Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/22708#discussion_r225391643 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects/objects.scala --- @@ -282,6 +283,27 @@ case class StaticInvoke( } } +/** + * When constructing [[Invoke]], the data type must be given, which may be not possible to define + * before analysis. This class acts like a placeholder for [[Invoke]], and will be replaced by + * [[Invoke]] during analysis after the input data is resolved. Data type passed to [[Invoke]] + * will be defined by applying [[dataTypeFunction]] to the data type of the input data. + */ +case class UnresolvedInvoke( --- End diff -- Should we move this to `unresolved.scala`? cc @cloud-fan
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