Github user mn-mikke commented on a diff in the pull request:
https://github.com/apache/spark/pull/21687#discussion_r200852015
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -695,6 +695,56 @@ abstract class TernaryExpression extends Expression {
}
}
+/**
+ * A trait resolving nullable, containsNull, valueContainsNull flags of
the output date type.
+ * This logic is usually utilized by expressions combining data from
multiple child expressions
+ * of non-primitive types (e.g. [[CaseWhen]]).
+ */
+trait NonPrimitiveTypeMergingExpression extends Expression
--- End diff --
My previous comment seems to be irrelevant since ```complex``` has already
been used (```findTypeForComplex```).
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