cloud-fan commented on code in PR #52443:
URL: https://github.com/apache/spark/pull/52443#discussion_r2378386945
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sql/core/src/test/scala/org/apache/spark/sql/execution/exchange/EnsureRequirementsSuite.scala:
##########
@@ -1196,6 +1197,253 @@ class EnsureRequirementsSuite extends
SharedSparkSession {
TransformExpression(BucketFunction, expr, Some(numBuckets))
}
+ test("ShufflePartitionIdPassThrough - avoid necessary shuffle when they are
compatible") {
+ withSQLConf(SQLConf.SHUFFLE_PARTITIONS.key -> "10") {
+ val plan1 = DummySparkPlan(
+ outputPartitioning =
ShufflePartitionIdPassThrough(DirectShufflePartitionID(exprA), 5))
+ val plan2 = DummySparkPlan(
+ outputPartitioning =
ShufflePartitionIdPassThrough(DirectShufflePartitionID(exprA), 5))
+ val smjExec = SortMergeJoinExec(exprA :: Nil, exprA :: Nil, Inner, None,
plan1, plan2)
+
+ EnsureRequirements.apply(smjExec) match {
+ case SortMergeJoinExec(
+ leftKeys,
+ rightKeys,
+ _,
+ _,
+ SortExec(_, _, DummySparkPlan(_, _, _:
ShufflePartitionIdPassThrough, _, _), _),
+ SortExec(_, _, DummySparkPlan(_, _, _:
ShufflePartitionIdPassThrough, _, _), _),
+ _
+ ) =>
+ assert(leftKeys === Seq(exprA))
+ assert(rightKeys === Seq(exprA))
+ case other => fail(s"We don't expect shuffle on neither sides, but
got: $other")
+ }
+ }
+ }
+
+ test("ShufflePartitionIdPassThrough incompatibility - different partitions")
{
+ withSQLConf(SQLConf.SHUFFLE_PARTITIONS.key -> "10") {
+ // Different number of partitions - should add shuffles
+ val plan1 = DummySparkPlan(
+ outputPartitioning =
ShufflePartitionIdPassThrough(DirectShufflePartitionID(exprA), 5))
+ val plan2 = DummySparkPlan(
+ outputPartitioning =
ShufflePartitionIdPassThrough(DirectShufflePartitionID(exprB), 8))
+ val smjExec = SortMergeJoinExec(exprA :: Nil, exprB :: Nil, Inner, None,
plan1, plan2)
+
+ EnsureRequirements.apply(smjExec) match {
+ case SortMergeJoinExec(_, _, _, _,
+ SortExec(_, _, ShuffleExchangeExec(p1: HashPartitioning, _, _, _),
_),
+ SortExec(_, _, ShuffleExchangeExec(p2: HashPartitioning, _, _, _),
_), _) =>
+ // Both sides should be shuffled to default partitions
+ assert(p1.numPartitions == 10)
+ assert(p2.numPartitions == 10)
+ assert(p1.expressions == Seq(exprA))
+ assert(p2.expressions == Seq(exprB))
+ case other => fail(s"Expected shuffles on both sides, but got: $other")
+ }
+ }
+ }
+
+ test("ShufflePartitionIdPassThrough incompatibility - key position
mismatch") {
+ withSQLConf(SQLConf.SHUFFLE_PARTITIONS.key -> "10") {
+ // Key position mismatch - should add shuffles
+ val plan1 = DummySparkPlan(
+ outputPartitioning =
ShufflePartitionIdPassThrough(DirectShufflePartitionID(exprA), 5))
+ val plan2 = DummySparkPlan(
+ outputPartitioning =
ShufflePartitionIdPassThrough(DirectShufflePartitionID(exprC), 5))
+ // Join on different keys than partitioning keys
+ val smjExec = SortMergeJoinExec(exprB :: Nil, exprD :: Nil, Inner, None,
plan1, plan2)
+
+ EnsureRequirements.apply(smjExec) match {
+ case SortMergeJoinExec(_, _, _, _,
+ SortExec(_, _, ShuffleExchangeExec(_: HashPartitioning, _, _, _), _),
+ SortExec(_, _, ShuffleExchangeExec(_: HashPartitioning, _, _, _),
_), _) =>
+ // Both sides shuffled due to key mismatch
+ case other => fail(s"Expected shuffles on both sides, but got: $other")
+ }
+ }
+ }
+
+ test("ShufflePartitionIdPassThrough vs HashPartitioning - always shuffles") {
+ withSQLConf(SQLConf.SHUFFLE_PARTITIONS.key -> "10") {
+ // ShufflePartitionIdPassThrough vs HashPartitioning - always adds
shuffles
+ val plan1 = DummySparkPlan(
+ outputPartitioning =
ShufflePartitionIdPassThrough(DirectShufflePartitionID(exprA), 5))
+ val plan2 = DummySparkPlan(
+ outputPartitioning = HashPartitioning(exprB :: Nil, 5))
+ val smjExec = SortMergeJoinExec(exprA :: Nil, exprB :: Nil, Inner, None,
plan1, plan2)
+
+ EnsureRequirements.apply(smjExec) match {
+ case SortMergeJoinExec(_, _, _, _,
+ SortExec(_, _, ShuffleExchangeExec(_: HashPartitioning, _, _, _), _),
+ SortExec(_, _, _: DummySparkPlan, _), _) =>
+ // Left side shuffled, right side kept as-is
+ case SortMergeJoinExec(_, _, _, _,
+ SortExec(_, _, _: DummySparkPlan, _),
+ SortExec(_, _, ShuffleExchangeExec(_: HashPartitioning, _, _, _),
_), _) =>
+ // Right side shuffled, left side kept as-is
+ case other => fail(s"Expected shuffle on at least one side, but got:
$other")
+ }
+ }
+ }
+
+ test("ShufflePartitionIdPassThrough vs SinglePartition - shuffles added") {
+ withSQLConf(SQLConf.SHUFFLE_PARTITIONS.key -> "5") {
+ // Even when compatible (numPartitions=1), shuffles added due to
canCreatePartitioning=false
+ val plan1 = DummySparkPlan(
+ outputPartitioning =
ShufflePartitionIdPassThrough(DirectShufflePartitionID(exprA), 1))
+ val plan2 = DummySparkPlan(outputPartitioning = SinglePartition)
+ val smjExec = SortMergeJoinExec(exprA :: Nil, exprB :: Nil, Inner, None,
plan1, plan2)
+
+ EnsureRequirements.apply(smjExec) match {
+ case SortMergeJoinExec(_, _, _, _,
+ SortExec(_, _, ShuffleExchangeExec(_: HashPartitioning, _, _, _), _),
+ SortExec(_, _, ShuffleExchangeExec(_: HashPartitioning, _, _, _),
_), _) =>
+ // Both sides shuffled due to canCreatePartitioning = false
+ case other => fail(s"Expected shuffles on both sides, but got: $other")
+ }
+ }
+ }
+
+ test("ShufflePartitionIdPassThrough - incompatible due to different
expressions " +
+ "with same base column") {
+ withSQLConf(SQLConf.SHUFFLE_PARTITIONS.key -> "10") {
+ // Even though both use exprA as base and have same numPartitions,
+ // different Pmod operations make them incompatible
+ val plan1 = DummySparkPlan(
+ outputPartitioning = ShufflePartitionIdPassThrough(
+ DirectShufflePartitionID(Pmod(exprA, Literal(10))), 5))
+ val plan2 = DummySparkPlan(
+ outputPartitioning = ShufflePartitionIdPassThrough(
+ DirectShufflePartitionID(Pmod(exprA, Literal(5))), 5))
+ val smjExec = SortMergeJoinExec(exprA :: Nil, exprA :: Nil, Inner, None,
plan1, plan2)
+
+ EnsureRequirements.apply(smjExec) match {
+ case SortMergeJoinExec(_, _, _, _,
+ SortExec(_, _, ShuffleExchangeExec(p1: HashPartitioning, _, _, _),
_),
+ SortExec(_, _, ShuffleExchangeExec(p2: HashPartitioning, _, _, _),
_), _) =>
+ // Both sides should be shuffled due to expression mismatch
+ assert(p1.numPartitions == 10)
+ assert(p2.numPartitions == 10)
+ assert(p1.expressions == Seq(exprA))
+ assert(p2.expressions == Seq(exprA))
+ case other => fail(s"Expected shuffles on both sides, but got: $other")
+ }
+ }
+ }
+
+ test("ShufflePartitionIdPassThrough - compatible with multiple clustering
keys") {
+ withSQLConf(SQLConf.SHUFFLE_PARTITIONS.key -> "10") {
+ // Both partitioned by exprA, joined on (exprA, exprB)
+ // Should be compatible because exprA positions overlap
+ val plan1 = DummySparkPlan(
+ outputPartitioning =
ShufflePartitionIdPassThrough(DirectShufflePartitionID(exprA), 5))
+ val plan2 = DummySparkPlan(
+ outputPartitioning =
ShufflePartitionIdPassThrough(DirectShufflePartitionID(exprA), 5))
+ val smjExec = SortMergeJoinExec(exprA :: exprB :: Nil, exprA :: exprB ::
Nil, Inner, None,
+ plan1, plan2)
+
+ EnsureRequirements.apply(smjExec) match {
+ case SortMergeJoinExec(
+ leftKeys,
+ rightKeys,
+ _,
+ _,
+ SortExec(_, _, DummySparkPlan(_, _, _:
ShufflePartitionIdPassThrough, _, _), _),
+ SortExec(_, _, DummySparkPlan(_, _, _:
ShufflePartitionIdPassThrough, _, _), _),
+ _
+ ) =>
+ assert(leftKeys === Seq(exprA, exprB))
+ assert(rightKeys === Seq(exprA, exprB))
+ case other => fail(s"We don't expect shuffle on neither sides with
multiple " +
+ s"clustering keys, but got: $other")
+ }
+ }
+ }
+
+ test("ShufflePartitionIdPassThrough - incompatible when partition key not in
join keys") {
+ withSQLConf(SQLConf.SHUFFLE_PARTITIONS.key -> "10") {
+ // Partitioned by exprA and exprB respectively, but joining on
completely different keys
+ // Should require shuffles because partition keys don't match join keys
+ val plan1 = DummySparkPlan(
+ outputPartitioning =
ShufflePartitionIdPassThrough(DirectShufflePartitionID(exprA), 5))
+ val plan2 = DummySparkPlan(
+ outputPartitioning =
ShufflePartitionIdPassThrough(DirectShufflePartitionID(exprB), 5))
+ val smjExec = SortMergeJoinExec(exprC :: Nil, exprD :: Nil, Inner, None,
plan1, plan2)
+
+ EnsureRequirements.apply(smjExec) match {
+ case SortMergeJoinExec(_, _, _, _,
+ SortExec(_, _, ShuffleExchangeExec(p1: HashPartitioning, _, _, _),
_),
+ SortExec(_, _, ShuffleExchangeExec(p2: HashPartitioning, _, _, _),
_), _) =>
+ // Both sides should be shuffled because partition keys not in join
keys
+ assert(p1.numPartitions == 10)
+ assert(p2.numPartitions == 10)
+ assert(p1.expressions == Seq(exprC))
+ assert(p2.expressions == Seq(exprD))
+ case other => fail(s"Expected shuffles on both sides due to key
mismatch, but got: $other")
+ }
+ }
+ }
+
+ test("ShufflePartitionIdPassThrough - cross position matching behavior") {
Review Comment:
This looks the same as `ShufflePartitionIdPassThrough incompatibility - key
position mismatch`?
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