Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/20858#discussion_r176901684
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -699,3 +699,88 @@ abstract class TernaryExpression extends Expression {
* and Hive function wrappers.
*/
trait UserDefinedExpression
+
+/**
+ * The trait covers logic for performing null save evaluation and code
generation.
+ */
+trait NullSafeEvaluation extends Expression
--- End diff --
Do we need to bring in `NullSafeEvaluation`? If only `ConcatArray` uses it,
we may not need to add this.
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