viirya commented on a change in pull request #26289:
[SPARK-28560][SQL][followup] support the build side to local shuffle reader as
far as possible in BroadcastHashJoin
URL: https://github.com/apache/spark/pull/26289#discussion_r340455498
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/OptimizeLocalShuffleReader.scala
##########
@@ -56,16 +76,25 @@ case class OptimizeLocalShuffleReader(conf: SQLConf)
extends Rule[SparkPlan] {
case e: ShuffleExchangeExec => e
}.length
}
-
+ // Check whether additional shuffle introduced. If introduced, revert the
local reader.
val numExchangeBefore = numExchanges(EnsureRequirements(conf).apply(plan))
- val numExchangeAfter =
numExchanges(EnsureRequirements(conf).apply(optimizedPlan))
-
- if (numExchangeAfter > numExchangeBefore) {
- logDebug("OptimizeLocalShuffleReader rule is not applied due" +
+ val numExchangeAfter =
numExchanges(EnsureRequirements(conf).apply(tmpOptimizedProbeSidePlan))
+ val optimizedProbeSidePlan = if (numExchangeAfter > numExchangeBefore) {
+ logDebug("OptimizeLocalShuffleReader rule is not applied in the probe
side due" +
" to additional shuffles will be introduced.")
plan
} else {
- optimizedPlan
+ tmpOptimizedProbeSidePlan
+ }
+ // Add the local reader in build side and will not check whether
Review comment:
will not check -> and do not need to check
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