Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/19901#discussion_r155383973 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala --- @@ -180,13 +180,15 @@ case class CaseWhen( } override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = { - // This variable represents whether the first successful condition is met or not. - // It is initialized to `false` and it is set to `true` when the first condition which - // evaluates to `true` is met and therefore is not needed to go on anymore on the computation - // of the following conditions. - val conditionMet = ctx.freshName("caseWhenConditionMet") - ctx.addMutableState(ctx.JAVA_BOOLEAN, ev.isNull) - ctx.addMutableState(ctx.javaType(dataType), ev.value) + // This variable holds the state of the result: + // -1 means the condition is not met yet and the result is unknown. + // 0 means the condition is met and result is not null. + // 1 means the condition is met and result is null. --- End diff -- The same here.
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