Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/20858#discussion_r178710167
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -700,3 +700,88 @@ abstract class TernaryExpression extends Expression {
* and Hive function wrappers.
*/
trait UserDefinedExpression
+
+/**
+ * The trait covers logic for performing null safe evaluation and code
generation.
+ */
+trait NullSafeEvaluation extends Expression
--- End diff --
nit: `trait NullSafeEvaluation extends Expression {`
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