dianfu commented on a change in pull request #7253: [FLINK-11074] 
[table][tests] Enable harness tests with RocksdbStateBackend and add harness 
tests for CollectAggFunction
URL: https://github.com/apache/flink/pull/7253#discussion_r241626349
 
 

 ##########
 File path: 
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/runtime/harness/HarnessTestBase.scala
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 @@ -491,13 +491,83 @@ class HarnessTestBase {
     distinctCountFuncName,
     distinctCountAggCode)
 
+  def createHarnessTester[KEY, IN, OUT](
+      dataStream: DataStream[_],
+      prefixOperatorName: String)
 
 Review comment:
   createHarnessTester will be used not only in agg related tests but also in 
other harness tests, such as stream join tests, temporal join tests, sort 
tests, etc. So field aggFieldAlias seems a little wired from my point of view. 
What about adding it when we really need it? At that time we may have a better 
idea on how such a field will look like. Thoughts?

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