cloud-fan commented on a change in pull request #29307:
URL: https://github.com/apache/spark/pull/29307#discussion_r463396354
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/OptimizeLocalShuffleReader.scala
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@@ -140,9 +140,9 @@ object OptimizeLocalShuffleReader {
def canUseLocalShuffleReader(plan: SparkPlan): Boolean = plan match {
case s: ShuffleQueryStageExec =>
- s.shuffle.canChangeNumPartitions
+ s.shuffle.canChangeNumPartitions && s.mapStats.isDefined
Review comment:
We should be able to turn the `if` into `assert`, but I'd like to only
do it in master to be safe.
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