cloud-fan commented on a change in pull request #25479: [SPARK-28356][FOLLOWUP]
fix case with different pre-shuffle partition numbers
URL: https://github.com/apache/spark/pull/25479#discussion_r314777426
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/ReduceNumShufflePartitions.scala
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@@ -82,7 +82,11 @@ case class ReduceNumShufflePartitions(conf: SQLConf)
extends Rule[SparkPlan] {
// `ShuffleQueryStageExec` gives null mapOutputStatistics when the input
RDD has 0 partitions,
// we should skip it when calculating the `partitionStartIndices`.
val validMetrics = shuffleMetrics.filter(_ != null)
- if (validMetrics.nonEmpty) {
+ // We may have different pre-shuffle partition numbers, don't reduce
shuffle partition number
Review comment:
let's also give an example about when we will have different pre-shuffle
partition numbers.
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