Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/11030#discussion_r51651322
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/memory.scala
---
@@ -46,6 +47,8 @@ case class MemoryStream[A : Encoder](id: Int, sqlContext:
SQLContext)
protected val logicalPlan = StreamingRelation(this)
protected val output = logicalPlan.output
protected val batches = new ArrayBuffer[Dataset[A]]
+
+ @volatile
--- End diff --
Technically not needed if you get rid of the (unused) `getCurrentOffset`
method.
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