Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/11804#discussion_r56908363
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/Source.scala
---
@@ -29,8 +30,13 @@ trait Source {
/** Returns the schema of the data from this source */
def schema: StructType
+ /** Returns the maximum available offset for this source. */
+ def getOffset: Option[Offset]
+
/**
- * Returns the next batch of data that is available after `start`, if
any is available.
+ * Returns the data that is is between the offsets (`start`, `end`].
When `start` is `None` then
+ * the batch should begin with the first available record. This method
must always return the
--- End diff --
That actually raises an issue. The start offset needs to be deterministic.
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