Github user tcondie commented on a diff in the pull request:
https://github.com/apache/spark/pull/15626#discussion_r85615504
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/Offset.scala
---
@@ -23,4 +23,16 @@ package org.apache.spark.sql.execution.streaming
* ordering of two [[Offset]] instances. We do assume that if two offsets
are `equal` then no
* new data has arrived.
*/
-trait Offset extends Serializable {}
+abstract class Offset {
+
+ /**
+ * A JSON-serialized representation of an Offset that is
+ * used for saving offsets to the offset log.
+ *
+ * @return JSON string encoding
+ */
+ def json: String
+}
+
+/** Used when loading */
--- End diff --
Added.
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