bowenliang123 commented on code in PR #6758:
URL: https://github.com/apache/kyuubi/pull/6758#discussion_r1808051905


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extensions/spark/kyuubi-spark-authz/src/main/scala/org/apache/kyuubi/plugin/spark/authz/ranger/RuleAuthorization.scala:
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@@ -34,23 +35,22 @@ case class RuleAuthorization(spark: SparkSession) extends 
Authorization(spark) {
     val auditHandler = new SparkRangerAuditHandler
     val ugi = getAuthzUgi(spark.sparkContext)
     val (inputs, outputs, opType) = PrivilegesBuilder.build(plan, spark)
-    val requests = new ArrayBuffer[AccessRequest]()
+    var requests = new HashMap[(AccessResource, AccessType), AccessRequest]()

Review Comment:
   > the unique key is NOT the `AccessRequest` itself but part of properties, 
the combination of ArrayBuffer with a HashSet looks fine to me.
   
   Noticed. But the `HashSet` still reily on the same logic with `hashCode` 
inside. And no proper customed method of  either `AccessRequest` or its parent 
class.



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