Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21687#discussion_r200801834
--- 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 --
nit:
```
trait XXX {
...
```
---
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
