cloud-fan commented on code in PR #41046:
URL: https://github.com/apache/spark/pull/41046#discussion_r1185700324
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sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/ReuseAdaptiveSubquery.scala:
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@@ -33,10 +33,13 @@ case class ReuseAdaptiveSubquery(
plan.transformAllExpressionsWithPruning(_.containsPattern(PLAN_EXPRESSION)) {
case sub: ExecSubqueryExpression =>
- val newPlan = reuseMap.getOrElseUpdate(sub.plan.canonicalized,
sub.plan)
- if (newPlan.ne(sub.plan)) {
- sub.withNewPlan(ReusedSubqueryExec(newPlan))
- } else {
+ // `InsertAdaptiveSparkPlan` compiles subquery for each exprId, then
the java object
+ // is always `eq` if two subqueries have same exprId.
+ // Check if the subquery can be reused manually instead of call
`getOrElseUpdate`.
Review Comment:
let's make the comment more explicit
```
// The subquery can be already reused (the same Java object) due to filter
pushdown
// of table cache. If it happens, we just need to wrap the current subquery
with `ReusedSubqueryExec`
// and no need to update te `reuseMap`.
```
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