cloud-fan commented on a change in pull request #32084:
URL: https://github.com/apache/spark/pull/32084#discussion_r718092390
##########
File path:
sql/core/src/test/scala/org/apache/spark/sql/execution/adaptive/AdaptiveQueryExecSuite.scala
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@@ -1705,6 +1705,89 @@ class AdaptiveQueryExecSuite
}
}
+ test("SPARK-34980: Support coalesce partition through union") {
+ def checkResultPartition(
+ df: Dataset[Row],
+ numUnion: Int,
+ numShuffleReader: Int,
+ numPartition: Int): Unit = {
+ df.collect()
+ assert(collect(df.queryExecution.executedPlan) {
+ case u: UnionExec => u
+ }.size == numUnion)
+ assert(collect(df.queryExecution.executedPlan) {
+ case r: AQEShuffleReadExec => r
+ }.size === numShuffleReader)
+ assert(df.rdd.partitions.length === numPartition)
+ }
+
+ Seq(true, false).foreach { combineUnionEnabled =>
+ val combineUnionConfig = if (combineUnionEnabled) {
+ "" -> ""
+ } else {
+ SQLConf.OPTIMIZER_EXCLUDED_RULES.key ->
+ "org.apache.spark.sql.catalyst.optimizer.CombineUnions"
+ }
+ // advisory partition size 1048576 has no special meaning, just a big
enough value
+ withSQLConf(SQLConf.ADAPTIVE_EXECUTION_ENABLED.key -> "true",
+ SQLConf.COALESCE_PARTITIONS_ENABLED.key -> "true",
+ SQLConf.ADVISORY_PARTITION_SIZE_IN_BYTES.key -> "1048576",
+ SQLConf.COALESCE_PARTITIONS_MIN_PARTITION_NUM.key -> "1",
+ SQLConf.SHUFFLE_PARTITIONS.key -> "10",
+ combineUnionConfig) {
+ withTempView("t1", "t2") {
+ spark.sparkContext.parallelize((1 to 10).map(i => TestData(i,
i.toString)), 2)
+ .toDF().createOrReplaceTempView("t1")
+ spark.sparkContext.parallelize((1 to 10).map(i => TestData(i,
i.toString)), 4)
+ .toDF().createOrReplaceTempView("t2")
+
+ // positive test that could be coalesced
+ checkResultPartition(
+ sql("""
+ |SELECT key, count(*) FROM t1 GROUP BY key
+ |UNION ALL
+ |SELECT * FROM t2
+ """.stripMargin),
+ 1,
Review comment:
can we put the parameter name to make the test more readable? `numUnion
= 1`
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