Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/20344#discussion_r162821736
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala
---
@@ -199,7 +199,7 @@ case class UnresolvedGenerator(name:
FunctionIdentifier, children: Seq[Expressio
override def prettyName: String = name.unquotedString
override def toString: String = s"'$name(${children.mkString(", ")})"
- override def eval(input: InternalRow = null):
TraversableOnce[InternalRow] =
+ override def eval(input: InternalRow = EmptyRow):
TraversableOnce[InternalRow] =
--- End diff --
Likewise this could be a functional change
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