viirya commented on a change in pull request #27333:
URL: https://github.com/apache/spark/pull/27333#discussion_r511309080
##########
File path:
sql/core/src/test/scala/org/apache/spark/sql/streaming/FlatMapGroupsWithStateSuite.scala
##########
@@ -1019,6 +1019,56 @@ class FlatMapGroupsWithStateSuite extends
StateStoreMetricsTest {
spark.createDataset(Seq(("a", 2), ("b", 1))).toDF)
}
+ testWithAllStateVersions("SPARK-29438: ensure UNION doesn't lead
(flat)MapGroupsWithState" +
+ " to use shifted partition IDs") {
+ val stateFunc = (key: String, values: Iterator[String], state:
GroupState[RunningCount]) => {
+ val count = state.getOption.map(_.count).getOrElse(0L) + values.size
+ state.update(RunningCount(count))
+ (key, count.toString)
+ }
+
+ def constructUnionDf(desiredPartitionsForInput1: Int)
+ : (MemoryStream[String], MemoryStream[String], DataFrame) = {
+ val input1 = MemoryStream[String](desiredPartitionsForInput1)
+ val input2 = MemoryStream[String]
+ val df1 = input1.toDF()
+ .select($"value", $"value")
+ val df2 = input2.toDS()
+ .groupByKey(x => x)
+ .mapGroupsWithState(stateFunc) // Types = State: MyState, Out: (Str,
Str)
+ .toDF()
+
+ // Unioned DF would have columns as (String, String)
+ (input1, input2, df1.union(df2))
+ }
+
+ withTempDir { checkpointDir =>
+ val (input1, input2, unionDf) = constructUnionDf(2)
+ testStream(unionDf, Update)(
+ StartStream(checkpointLocation = checkpointDir.getAbsolutePath),
+ MultiAddData(input1, "input1-a")(input2, "input2-a"),
+ CheckNewAnswer(("input1-a", "input1-a"), ("input2-a", "1")),
+ StopStream
+ )
+
+ // We're restoring the query with different number of partitions in left
side of UNION,
+ // which may lead right side of union to have mismatched partition IDs
(e.g. if it relies on
+ // TaskContext.partitionId()). This test will verify
(flat)MapGroupsWithState doesn't have
+ // such issue.
+
+ val (newInput1, newInput2, newUnionDf) = constructUnionDf(3)
+
+ newInput1.addData("input1-a")
+ newInput2.addData("input2-a")
Review comment:
Why we need to add data here? Don't we rely on `MultiAddData` below to
add more data to `newInput1` and `newInput2`?
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