Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/10331#discussion_r47802783
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -49,6 +49,7 @@ import org.apache.spark.sql.types._
*
*/
abstract class Expression extends TreeNode[Expression] {
+ protected def nullabilitySuffix: String = if (nullable) "<?>" else "<!>"
--- End diff --
This is used to show nullability in the query plan / expression tree. I
found it useful while debugging nullability issues.
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