jon-wei commented on issue #8349: Fix ClassCastException for TopN with 
long-type dimension
URL: https://github.com/apache/incubator-druid/pull/8349#issuecomment-523696848
 
 
   I had looked into how to make a test for this, for unit testing, I initially 
tried setting up a `toolChest.mergeResults` merging test (like how 
TopNBenchmark merges queryable indices) using the replication case described in 
https://github.com/apache/incubator-druid/issues/8348, but that doesn't have 
the JSON serde step.
   
   An integration test could be made to specifically test this, but the test 
would require two historicals, and the integration tests are already somewhat 
resource constrained (it also feels a little overkill to me)
   
   I could make a unit test that just tests DimValHolder type conversion, but 
that doesn't really test the original bug situation.
   
   Any thoughts?
   

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