dylanwong250 commented on code in PR #52148:
URL: https://github.com/apache/spark/pull/52148#discussion_r2310739331


##########
sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/v2/state/StateDataSourceChangeDataReadSuite.scala:
##########
@@ -322,4 +336,91 @@ abstract class StateDataSourceChangeDataReaderSuite 
extends StateDataSourceTestB
       checkAnswer(keyToNumValuesDf, keyToNumValuesDfExpectedDf)
     }
   }
+
+  test("read change feed past multiple snapshots") {
+    withSQLConf("spark.sql.streaming.stateStore.minDeltasForSnapshot" -> "2") {
+      withTempDir { tempDir =>
+        val inputData = MemoryStream[Int]
+        val df = inputData.toDF().groupBy("value").count()
+        testStream(df, OutputMode.Update)(
+          StartStream(checkpointLocation = tempDir.getAbsolutePath),
+          AddData(inputData, 1, 2, 3, 4, 1),
+          ProcessAllAvailable(),
+          AddData(inputData, 2, 3, 4, 5),
+          ProcessAllAvailable(),
+          AddData(inputData, 3, 4, 5, 6),
+          ProcessAllAvailable(),
+          AddData(inputData, 1, 1),
+          ProcessAllAvailable(),
+          AddData(inputData, 1, 1),
+          ProcessAllAvailable(),
+          AddData(inputData, 1, 1),
+          ProcessAllAvailable()
+        )
+
+        val stateDf = spark.read.format("statestore")
+          .option(StateSourceOptions.READ_CHANGE_FEED, value = true)
+          .option(StateSourceOptions.CHANGE_START_BATCH_ID, 0)
+          .option(StateSourceOptions.CHANGE_END_BATCH_ID, 5)
+          .load(tempDir.getAbsolutePath)
+
+        val expectedDf = Seq(
+          Row(0L, "update", Row(3), Row(1), 1),

Review Comment:
   Added a test in this suite with a `delete` in the change feed. 
`StateDataSourceTransformWithStateSuite` also has a few tests with `append` and 
`delete`.



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