Github user nongli commented on a diff in the pull request:
https://github.com/apache/spark/pull/9453#discussion_r43979985
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/ExchangeCoordinator.scala
---
@@ -135,6 +139,11 @@ private[sql] class ExchangeCoordinator(
// Make sure we do get the same number of pre-shuffle partitions for
those stages.
val distinctNumPreShufflePartitions =
mapOutputStatistics.map(stats =>
stats.bytesByPartitionId.length).distinct
+ // The reason that we are expecting a single value of the number of
pre-shuffle partitions
+ // is that when we add Exchanges, we set the number of pre-shuffle
partitions
+ // (i.e. map output partitions) using a static setting, which is the
value of
+ // spark.sql.shuffle.partitions. Even two input RDDs are having
different number of partitions,
--- End diff --
Nit. Even if two input RDDs have different number of ...
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