[feature](Nereids) support select distinct with aggregate

[924060929]

support select distinct with aggregate like this:

SELECT
      DISTINCT dt,
      count(dt2) over (partition by dt) as num
      from
      (select 1 as dt,2 as dt2)t
group by dt,dt2;

[doris-robot]

Thank you for your contribution to Apache Doris.
Don't know what should be done next? See How to process your PR

Since 2024-03-18, the Document has been moved to doris-website.
See Doris Document.

[github-actions]

PR approved by at least one committer and no changes requested.

[github-actions]

PR approved by anyone and no changes requested.

[924060929]

run buildall