Dandandan commented on PR #5408:
URL: 
https://github.com/apache/arrow-datafusion/pull/5408#issuecomment-1447760368

   > @Dandandan, I reviewed the failed test and identified the root cause of 
the issue. It appears that the problem occurred because there was a 
modification made to the structure of the `DistinctScalarValues` from 
`DistinctScalarValues(Vec<ScalarValue>)` to 
`DistinctScalarValues(ScalarValue)`. This change caused the test to fail 
because the test was designed to work with two different types of data.
   > 
   > 
https://github.com/apache/arrow-datafusion/blob/16cb4c122f8ea110bc7adf425f4905fa06ed2c81/datafusion/physical-expr/src/aggregate/count_distinct.rs#L608-L642
   
   Ok. I think we have to update (or remove) the tests to update the 
expectations that we no longer support multiple columns. 


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