Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/15102#discussion_r81836478
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala
---
@@ -530,3 +530,8 @@ object StreamExecution {
def nextId: Long = _nextId.getAndIncrement()
}
+
+/**
+ * A special thread to run the stream query.
--- End diff --
You might comment that we actually check for this class elsewhere. This
part is not super clear to me.
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