Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/13335#discussion_r65024979
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/CompositeOffset.scala
---
@@ -22,7 +22,7 @@ package org.apache.spark.sql.execution.streaming
* [[Source]]s that are present in a streaming query. This is similar to
simplified, single-instance
* vector clock that must progress linearly forward.
*/
-case class CompositeOffset(offsets: Seq[Option[Offset]]) extends Offset {
+case class CompositeOffset(offsets: Array[Option[Offset]]) extends Offset {
--- End diff --
Change the type to `Array` as jackson-module-scala doesn't support
`Seq[Option[X]]`. Probably because of the type erasure.
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