[GitHub] [spark] MrDLontheway commented on a diff in pull request #38893: [Spark-40099][SQL] Merge adjacent CaseWhen branches if their values are the same

Thu, 08 Dec 2022 03:12:05 -0800 


MrDLontheway commented on code in PR #38893:
URL: https://github.com/apache/spark/pull/38893#discussion_r1043227501


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -639,6 +639,26 @@ object RemoveNoopOperators extends Rule[LogicalPlan] {
   }
 }
 
+/**
+ * Merge case condition expression with same value.
+ */
+object MergeConditionWithValue extends Rule[LogicalPlan] {

Review Comment:
   this is 2000 branches run time
   <img width="1260" alt="image" 
src="https://user-images.githubusercontent.com/29403543/206430556-08ffe134-2d3e-48ab-bdb1-d941957869e1.png";>
   



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