cloud-fan commented on a change in pull request #27226: [SPARK-30524] [SQL]
Disable OptimizeSkewedJoin rule when introducing additional shuffle
URL: https://github.com/apache/spark/pull/27226#discussion_r367213628
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/OptimizeSkewedJoin.scala
##########
@@ -114,79 +120,124 @@ case class OptimizeSkewedJoin(conf: SQLConf) extends
Rule[SparkPlan] {
stage.shuffle.shuffleDependency.rdd.partitions.length
}
- def handleSkewJoin(plan: SparkPlan): SparkPlan = plan.transformUp {
- case smj @ SortMergeJoinExec(leftKeys, rightKeys, joinType, condition,
- s1 @ SortExec(_, _, left: ShuffleQueryStageExec, _),
- s2 @ SortExec(_, _, right: ShuffleQueryStageExec, _))
- if supportedJoinTypes.contains(joinType) =>
- val leftStats = getStatistics(left)
- val rightStats = getStatistics(right)
- val numPartitions = leftStats.bytesByPartitionId.length
-
- val leftMedSize = medianSize(leftStats)
- val rightMedSize = medianSize(rightStats)
- val leftSizeInfo = s"median size: $leftMedSize, max size:
${leftStats.bytesByPartitionId.max}"
- val rightSizeInfo = s"median size: $rightMedSize," +
- s" max size: ${rightStats.bytesByPartitionId.max}"
- logDebug(
- s"""
- |Try to optimize skewed join.
- |Left side partition size: $leftSizeInfo
- |Right side partition size: $rightSizeInfo
+ private def containShuffleQueryStage(plan : SparkPlan): (Boolean,
ShuffleQueryStageExec) =
+ plan match {
+ case stage: ShuffleQueryStageExec => (true, stage)
+ case sort: SortExec if (sort.child.isInstanceOf[ShuffleQueryStageExec])
=>
+ (true, sort.child.asInstanceOf[ShuffleQueryStageExec])
+ case _ => (false, null)
+ }
+
+ private def reOptimizeChild(
+ skewedReader: SkewedPartitionReaderExec,
+ child: SparkPlan): SparkPlan = child match {
+ case sort: SortExec if (sort.child.isInstanceOf[ShuffleQueryStageExec]) =>
Review comment:
ditto
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