Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/11809#discussion_r57090137
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -80,6 +80,12 @@ abstract class Expression extends TreeNode[Expression] {
def nullable: Boolean
+ /**
+ * Indicates whether this expression is null intolerant. If this is true,
+ * then any null input will result in null output).
+ */
+ def nullIntolerant: Boolean = true
--- End diff --
Also, I think its better to do it with a `trait` since then you can use
InteliJ to list all the instances.
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