Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/20717#discussion_r176318729
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/QueryPlanConstraints.scala
---
@@ -91,7 +97,7 @@ trait QueryPlanConstraints { self: LogicalPlan =>
* Recursively explores the expressions which are null intolerant and
returns all attributes
* in these expressions.
*/
- private def scanNullIntolerantAttribute(expr: Expression):
Seq[Attribute] = expr match {
+ protected def scanNullIntolerantAttribute(expr: Expression):
Seq[Attribute] = expr match {
--- End diff --
Let keep this `private` because this is used only here.
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