peter-toth commented on a change in pull request #26044: [SPARK-29375][SQL]
Exchange reuse across all subquery levels
URL: https://github.com/apache/spark/pull/26044#discussion_r344507817
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/Exchange.scala
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@@ -52,6 +54,13 @@ abstract class Exchange extends UnaryExecNode {
case class ReusedExchangeExec(override val output: Seq[Attribute], child:
Exchange)
extends LeafExecNode {
+ override def equals(that: Any): Boolean = that match {
Review comment:
A `ReusedExchangeExec` is a reference to an `Exchange`, so 2
`ReusedExchangeExec`s should be equal only if they are pointing to the same
`Exchange` instance.
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