LantaoJin commented on a change in pull request #29021:
URL: https://github.com/apache/spark/pull/29021#discussion_r456311324
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/OptimizeLocalShuffleReader.scala
##########
@@ -142,6 +142,14 @@ object OptimizeLocalShuffleReader {
def canUseLocalShuffleReader(plan: SparkPlan): Boolean = plan match {
case s: ShuffleQueryStageExec =>
s.shuffle.canChangeNumPartitions
+ // This CustomShuffleReaderExec used in skew side, its numPartitions
increased.
Review comment:
Not exactly. In this more general skew join handling, we can match more
patterns. For example, we can handle skew join like
https://user-images.githubusercontent.com/1853780/87743215-01e9e780-c81b-11ea-97d9-f274b379912e.png.
The number partitions of `CustomShuffleReader` in the the BCJ (changed from
SMJ by AE) is not equals to the anther side. So simply, I disable
`createLocalReader`.
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
