Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/9358#discussion_r43820397
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -441,6 +537,17 @@ class Dataset[T] private(
/** Collects the elements to an Array. */
def collect(): Array[T] = rdd.collect()
+ /**
+ * (Java-specific)
+ * Collects the elements to a Java list.
+ *
+ * Due to the incompatibility problem between Scala and Java, the return
type of [[collect()]] at
--- End diff --
This just means that the RDD has the wrong classtag. We need to find a way
to pass the classtag from the encoder before calling collect.
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