Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/4582#discussion_r24643956
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/json/JsonRDD.scala
---
@@ -306,6 +306,10 @@ private[sql] object JsonRDD extends Logging {
val parsed = mapper.readValue(record, classOf[Object]) match {
case map: java.util.Map[_, _] =>
scalafy(map).asInstanceOf[Map[String, Any]] :: Nil
case list: java.util.List[_] =>
scalafy(list).asInstanceOf[Seq[Map[String, Any]]]
+ case _ =>
+ sys.error(
+ s"Failed to parse record $record. Please make sure that " +
+ "every record in the dataset is a JSON object or an array
of JSON objects.")
--- End diff --
I'd say something like `each line of the file is a valid json object or
array` since its not obvious to non-hadoop people that this is how records
might be split.
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