Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18641#discussion_r129474546
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala
---
@@ -270,37 +271,91 @@ case class CaseWhenCodegen(
// }
// }
// }
+
+ val isNull = ctx.freshName("caseWhenIsNull")
+ val value = ctx.freshName("caseWhenValue")
+ // Split these expressions only if they are created from a row object
--- End diff --
This comment is put at wrong place?
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