Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/11804#discussion_r56734137
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/CompositeOffset.scala
---
@@ -52,6 +52,21 @@ case class CompositeOffset(offsets: Seq[Option[Offset]])
extends Offset {
case i if i == 0 => 0
case i if i > 0 => 1
}
+
+ /**
+ * Unpacks an offset into [[StreamProgress]] by associating each offset
with the order list of
+ * sources.
+ *
+ * This method is typically used to associate a serialized offset with
actual sources (which
+ * cannot be serialized).
+ */
+ def toStreamProgress(
+ sources: Seq[Source],
+ dest: StreamProgress = new StreamProgress): StreamProgress = {
--- End diff --
This optional thing is never used. I think its better to not have optional
params if its not even exploited.
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