Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/15771#discussion_r86610683
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala
---
@@ -499,6 +499,7 @@ case class JsonToStruct(schema: StructType, options:
Map[String, String], child:
override def eval(input: InternalRow): Any = {
try parser.parse(child.eval(input).toString).head catch {
+ case _: NullPointerException => null
--- End diff --
I would consider doing this with an `if`. I think catching and throwing an
exception can be expensive (though maybe JVM optimizations save us?). Since
its easy I'd rather not rely on that.
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