[I] DISTINCTCOUNTMV returns incorrect value when field is included in select/group by [pinot]

[via GitHub]

aw381246 opened a new issue, #12429:
URL: https://github.com/apache/pinot/issues/12429

   If the field passed into the distinctcountmv function is included in the 
list of select / group by fields, it will return incorrect counts.
   
   In the case below, the result for each row should be a distinctcount = 1 
instead of 2.
   
   If the array has n number of items, the distinctcount will return n instead 
of 1
   
   
![image](https://github.com/apache/pinot/assets/70593020/8aa67b27-c332-447a-88ed-f28523216a9a)
   
![image](https://github.com/apache/pinot/assets/70593020/2c7101f9-85a5-44d7-88df-f856bc6bb16a)
   


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