peter-toth commented on a change in pull request #26044:
[SPARK-29375][SQL][WIP] Exchange reuse across all subquery levels
URL: https://github.com/apache/spark/pull/26044#discussion_r332363708
##########
File path:
sql/core/src/test/scala/org/apache/spark/sql/execution/PlannerSuite.scala
##########
@@ -470,7 +470,7 @@ class PlannerSuite extends SharedSparkSession {
Inner,
None,
shuffle,
- shuffle)
+ shuffle.copy())
Review comment:
If a plan contains the exact same instance of Exchange multiple times then
it makes no sense to replace one of the instances to a ReusedExchange.
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