mgaido91 commented on a change in pull request #24214: [SPARK-27279][SQL] Reuse
subquery should compare child plan of `SubqueryExec`
URL: https://github.com/apache/spark/pull/24214#discussion_r269133230
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/subquery.scala
##########
@@ -125,15 +125,15 @@ case class PlanSubqueries(sparkSession: SparkSession)
extends Rule[SparkPlan] {
case class ReuseSubquery(conf: SQLConf) extends Rule[SparkPlan] {
def apply(plan: SparkPlan): SparkPlan = {
- if (!conf.exchangeReuseEnabled) {
+ if (!conf.subqueryReuseEnabled) {
return plan
}
// Build a hash map using schema of subqueries to avoid O(N*N) sameResult
calls.
val subqueries = mutable.HashMap[StructType, ArrayBuffer[SubqueryExec]]()
plan transformAllExpressions {
case sub: ExecSubqueryExpression =>
val sameSchema = subqueries.getOrElseUpdate(sub.plan.schema,
ArrayBuffer[SubqueryExec]())
- val sameResult = sameSchema.find(_.sameResult(sub.plan))
+ val sameResult = sameSchema.find(_.child.sameResult(sub.plan.child))
Review comment:
I am not sure either about this fix. I remember this problem which I tried
to fix in
https://github.com/apache/spark/pull/22518/commits/36fa664c6d251901270984115ff2ebfd1b665fca.
As you can see, the PR didn't actually do this fix as per @cloud-fan 's
comment. So I am pinging him here for reviewing this too. Anyway, when I
debugged it, the problem was that being the same object according to equals,
the tree was not updated, so I see no reason for the current fix.
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