[GitHub] [spark] cloud-fan commented on a change in pull request #24735: [SPARK-27871][SQL] LambdaVariable should use per-query unique IDs instead of globally unique IDs

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cloud-fan commented on a change in pull request #24735: [SPARK-27871][SQL] LambdaVariable should use per-query unique IDs instead of globally unique IDs
URL: https://github.com/apache/spark/pull/24735#discussion_r288827866
 
 

 ##########
 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects/objects.scala
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 @@ -595,12 +623,15 @@ case class LambdaVariable(
   }
 
   override def genCode(ctx: CodegenContext): ExprCode = {
-    val isNullValue = if (nullable) {
-      JavaCode.isNullVariable(isNull)
+    // The id can be negative if it's reassigned by `ReassignLambdaVariableID`.
+    val suffix = "lambda_variable_" + math.abs(id)
 
 Review comment:
   fixed.

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