iodone commented on code in PR #4232:
URL: https://github.com/apache/kyuubi/pull/4232#discussion_r1099620386


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kyuubi-common/src/main/scala/org/apache/kyuubi/service/BackendService.scala:
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@@ -91,7 +91,7 @@ trait BackendService {
       foreignTable: String): OperationHandle
   def getQueryId(operationHandle: OperationHandle): String
 
-  def getOperationStatus(operationHandle: OperationHandle): OperationStatus
+  def getOperationStatus(operationHandle: OperationHandle, maxWait: Long = 0): 
OperationStatus

Review Comment:
   `Backendservice` mixed with `BackendServiceMetric`, using multiple 
inheritance to implement the metric getting wrapper, must have the same parent 
class. Adding a method will cause a `BackenServiceMetric` compilation error



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