Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/17541#discussion_r110199279
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/QueryPlan.scala
---
@@ -372,49 +410,19 @@ abstract class QueryPlan[PlanType <:
QueryPlan[PlanType]] extends TreeNode[PlanT
* enhancements like caching. However, it is not acceptable to return
true if the results could
* possibly be different.
*
- * By default this function performs a modified version of equality that
is tolerant of cosmetic
- * differences like attribute naming and or expression id differences.
Operators that
- * can do better should override this function.
+ * This function performs a modified version of equality that is
tolerant of cosmetic
+ * differences like attribute naming and or expression id differences.
*/
- def sameResult(plan: PlanType): Boolean = {
- val left = this.canonicalized
- val right = plan.canonicalized
- left.getClass == right.getClass &&
- left.children.size == right.children.size &&
- left.cleanArgs == right.cleanArgs &&
- (left.children, right.children).zipped.forall(_ sameResult _)
- }
+ final def sameResult(other: PlanType): Boolean = this.canonicalized ==
other.canonicalized
--- End diff --
@dilipbiswal Yes or no. If it is case class, scala compiler will help you
define a default equals. If it is class, you need to define it by yourselves.
For example,
```Scala
class NestedObj (i: Int)
val m = new NestedObj(3)
val n = new NestedObj(3)
assert(m != n)
```
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