[I] Remove duplicated alias in Sort [datafusion]

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

jayzhan211 opened a new issue, #14895:
URL: https://github.com/apache/datafusion/issues/14895

   ### Describe the bug
   
   ```
   query TT
   explain SELECT count(*) order by count(*);
   ----
   logical_plan
   01)Projection: count(*)
   02)--Sort: count(Int64(1)) AS count(*) AS count(*) ASC NULLS LAST
   03)----Projection: count(Int64(1)) AS count(*), count(Int64(1))
   04)------Aggregate: groupBy=[[]], aggr=[[count(Int64(1))]]
   05)--------EmptyRelation
   physical_plan
   01)ProjectionExec: expr=[1 as count(*)]
   02)--PlaceholderRowExec
   ```
   
   We can see that Sort has two `count(*)`
   
   `Sort: count(Int64(1)) AS count(*) AS count(*) ASC NULLS LAST`
   
   I think ideally we should has single alias
   
   ### To Reproduce
   
   _No response_
   
   ### Expected behavior
   
   _No response_
   
   ### Additional context
   
   _No response_


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