lifulong commented on code in PR #32816:
URL: https://github.com/apache/spark/pull/32816#discussion_r1701573785
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sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/AdaptiveSparkPlanExec.scala:
##########
@@ -97,27 +97,36 @@ case class AdaptiveSparkPlanExec(
AQEUtils.getRequiredDistribution(inputPlan)
}
+ @transient private val costEvaluator =
+ conf.getConf(SQLConf.ADAPTIVE_CUSTOM_COST_EVALUATOR_CLASS) match {
+ case Some(className) => CostEvaluator.instantiate(className,
session.sparkContext.getConf)
+ case _ =>
SimpleCostEvaluator(conf.getConf(SQLConf.ADAPTIVE_FORCE_OPTIMIZE_SKEWED_JOIN))
+ }
+
// A list of physical plan rules to be applied before creation of query
stages. The physical
// plan should reach a final status of query stages (i.e., no more addition
or removal of
// Exchange nodes) after running these rules.
- @transient private val queryStagePreparationRules: Seq[Rule[SparkPlan]] =
Seq(
- RemoveRedundantProjects,
+ @transient private val queryStagePreparationRules: Seq[Rule[SparkPlan]] = {
// For cases like `df.repartition(a, b).select(c)`, there is no
distribution requirement for
// the final plan, but we do need to respect the user-specified
repartition. Here we ask
// `EnsureRequirements` to not optimize out the user-specified
repartition-by-col to work
// around this case.
- EnsureRequirements(optimizeOutRepartition =
requiredDistribution.isDefined),
- RemoveRedundantSorts,
- DisableUnnecessaryBucketedScan
- ) ++ context.session.sessionState.queryStagePrepRules
+ val ensureRequirements =
+ EnsureRequirements(requiredDistribution.isDefined, requiredDistribution)
+ Seq(
+ RemoveRedundantProjects,
+ ensureRequirements,
+ RemoveRedundantSorts,
+ DisableUnnecessaryBucketedScan,
+ OptimizeSkewedJoin(ensureRequirements, costEvaluator)
Review Comment:
hello, i have a question here
why change OptimizeSkewedJoin rule from queryStageOptimizerRules to
queryStagePreparationRules, queryStagePreparationRules will used in the whole
plan other than current new stage, this will cause ValidateRequirements check
false while the whole plan contains WindowGroupLimitExec(row_number) or
HashAggrageteExec(group by) node after skew join
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