Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/10541#discussion_r48791281
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/literals.scala
---
@@ -213,6 +215,34 @@ case class Literal protected (value: Any, dataType:
DataType)
}
}
}
+
+ override def sql: Option[String] = Option((value, dataType) match {
+ case _ if value == null =>
+ "NULL"
--- End diff --
Will we lose data type for this null literal? Should we create a cast if
the data type is not `NullType`?
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