Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/3708#discussion_r21935456
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/json/JsonRDD.scala
---
@@ -263,6 +263,8 @@ private[sql] object JsonRDD extends Logging {
val elementType = typeOfArray(array)
buildKeyPathForInnerStructs(array, elementType) :+ (key,
elementType)
}
+ // we couldn't tell what the type is if the value is null or empty
string
+ case (key: String, value) if value == "" || value == null => (key,
NullType) :: Nil
--- End diff --
The null case makes sense to me, but why `""` as well? That seems to be
unequivocally a `String`
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