cloud-fan commented on a change in pull request #25479:
[SPARK-28356][SHUFFLE][FOLLOWUP] Fix case with different pre-shuffle partition
numbers
URL: https://github.com/apache/spark/pull/25479#discussion_r315050715
##########
File path:
sql/core/src/test/scala/org/apache/spark/sql/execution/ReduceNumShufflePartitionsSuite.scala
##########
@@ -587,4 +587,22 @@ class ReduceNumShufflePartitionsSuite extends
SparkFunSuite with BeforeAndAfterA
}
withSparkSession(test, 200, None)
}
+
+ test("Union two datasets with different pre-shuffle partition number") {
+ val test: SparkSession => Unit = { spark: SparkSession =>
+ val df1 = spark.range(3).join(spark.range(3), "id").toDF()
+ val df2 = spark.range(3).groupBy().sum()
+
+ val resultDf = df1.union(df2)
+
+ checkAnswer(resultDf, Seq((0), (1), (2), (3)).map(i => Row(i)))
Review comment:
Can you fill the `Does this PR introduce any user-facing change` section?
Changing a query from failure to runnable is a user-facing change.
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