Jimexist commented on pull request #622:
URL: https://github.com/apache/arrow-datafusion/pull/622#issuecomment-868956556
Postgres is totally okay with dup names in the projection phase:
```
[postgres] # select max(c1) over (), max(c1) over (), max(c1) over
(partition by c1) from test limit 3;
max | max | max
-----+-----+-----
e | e | a
e | e | a
e | e | a
(3 rows)
```
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