Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/17219#discussion_r106744000
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala
---
@@ -373,22 +380,66 @@ class StreamExecution(
* - currentBatchId
* - committedOffsets
* - availableOffsets
+ * The basic structure of this method is as follows:
+ *
+ * Identify (from the offset log) the offsets used to run the last batch
+ * IF a last batch exists THEN
+ * Set the next batch to that last batch
+ * Check the commit log to see which batch was committed last
+ * IF the last batch was committed THEN
+ * Call getBatch using the last batch start and end offsets
--- End diff --
Add the reason regarding why we do this.
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