Jimexist opened a new issue #621:
URL: https://github.com/apache/arrow-datafusion/issues/621
**Describe the bug**
given window functions on the same col with same function but different
partition by and order by, the schema is failing due to conflict.
**To Reproduce**
Steps to reproduce the behavior:
```
> select max(c1) over () max_c1, max(c1) over (partition by c2) max_c1_c2
from test;
Plan("Schema contains duplicate unqualified field name 'MAX(test.c1)'")
```
**Expected behavior**
it shall work
**Additional context**
Add any other context about the problem here.
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