Github user maryannxue commented on a diff in the pull request:
https://github.com/apache/spark/pull/22030#discussion_r208411022
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/RelationalGroupedDataset.scala ---
@@ -384,6 +392,10 @@ class RelationalGroupedDataset protected[sql](
.sort(pivotColumn) // ensure that the output columns are in a
consistent logical order
.collect()
.map(_.get(0))
+ .collect {
--- End diff --
Use "map"?
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