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Remove duplicated alias in Sort #14895

@jayzhan211

Description

@jayzhan211

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

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