Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/16154#discussion_r91152561
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/api/r/SQLUtils.scala
---
@@ -247,7 +247,7 @@ private[sql] object SQLUtils extends Logging {
dataType match {
case 's' =>
// Read StructType for DataFrame
- val fields = SerDe.readList(dis).asInstanceOf[Array[Object]]
+ val fields = SerDe.readList(dis, jvmObjectTracker =
null).asInstanceOf[Array[Object]]
--- End diff --
That would be ideal but requires a major refactoring, because we use
`SerDe` as a singleton in many places. And we haven't fully discussed how to
handle multiple active `RBackend`s yet.
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