Re: [I] `select count(distinct ..)` query doesn't go to the specialized distinct accumulator [datafusion]

["jayzhan211 (via GitHub)" <gi...@apache.org>]

jayzhan211 commented on issue #15850:
URL: https://github.com/apache/datafusion/issues/15850#issuecomment-2848380600

   Another idea is that what if we alter this plan to count distinct specific
   
   ```
   05)--------AggregateExec: mode=FinalPartitioned, gby=[alias1@0 as alias1], aggr=[]
   ```
   
   ```
   05)--------AggregateExec: mode=Final, gby=[alias1@0 as alias1], aggr=[], count_distinct_specialized=true
   ```
   
   And, we return the sum of group keys from each partition, it should be the same result as the output of `02)--AggregateExec: mode=Final, gby=[], aggr=[count(alias1)]`. 


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