wangyum commented on a change in pull request #31189:
URL: https://github.com/apache/spark/pull/31189#discussion_r558037693
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
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@@ -620,6 +620,30 @@ object PushFoldableIntoBranches extends Rule[LogicalPlan]
with PredicateHelper {
}
}
+/**
+ * Remove duplicated case when branches.
+ */
+object RemoveDuplicatedBranches extends Rule[LogicalPlan] with PredicateHelper
{
+
+ private def contains(branches: Seq[(Expression, Expression)], elem:
(Expression, Expression)) = {
+ branches.exists { case (condExpr, valueExpr) =>
+ condExpr.semanticEquals(elem._1) && valueExpr.semanticEquals(elem._2)
+ }
Review comment:
Could we support another case? ```CASE WHEN cond1 THEN values1 WHEN
cond1 THEN values2 END``` => ```CASE WHEN cond1 THEN values1 END```.
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