Github user robert3005 commented on a diff in the pull request:
https://github.com/apache/spark/pull/14615#discussion_r74789001
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -2494,16 +2494,18 @@ class Dataset[T] private[sql](
* @since 2.0.0
*/
def toJSON: Dataset[String] = {
- val rowSchema = this.schema
- val rdd: RDD[String] = queryExecution.toRdd.mapPartitions { iter =>
+ import sparkSession.implicits.newStringEncoder
--- End diff --
The encoder is for the implicit mapPartitions argument. We need to have
Encoder[String] for the output. Will put it just above the mappartitions call
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