Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10239#discussion_r47184698
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects.scala
---
@@ -326,19 +326,28 @@ case class WrapOption(child: Expression)
* A place holder for the loop variable used in [[MapObjects]]. This
should never be constructed
* manually, but will instead be passed into the provided lambda function.
*/
-case class LambdaVariable(value: String, isNull: String, dataType:
DataType) extends Expression {
+case class LambdaVariable(value: String, isNull: String, dataType:
DataType) extends LeafExpression
+ with Unevaluable {
- override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode):
String =
- throw new UnsupportedOperationException("Only calling gen() is
supported.")
+ override def nullable: Boolean = true
--- End diff --
I think the `loopVar` is nullable?
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