kmitchener opened a new issue, #2869:
URL: https://github.com/apache/arrow-datafusion/issues/2869
**Describe the bug**
A clear and concise description of what the bug is.
Was attempting to concisely calculate growth rates using window functions.
Queries like this:
```sql
select col1, idx, count(*), sum(amount), lag(sum(amount), 1) over (order by
idx) as prev_amount,
sum(amount) - lag(sum(amount), 1) over (order by idx) as difference from (
select * from (values ('a', 1, 100), ('a', 2, 150)) as t (col1, idx, amount)
) a
group by col1, idx;
```
or
```sql
select 1 - lag(amount, 1) over (order by idx) from (values ('a', 1, 100),
('a', 2, 150)) as t (col1, idx, amount)
```
Results in
```
NotImplemented("Physical plan does not support logical expression
LAG(#SUM(a.amount), Int64(1)) ORDER BY [#a.idx ASC NULLS LAST]")
```
**To Reproduce**
Steps to reproduce the behavior:
use a window function in an expression
**Expected behavior**
A clear and concise description of what you expected to happen.
**Additional context**
Add any other context about the problem here.
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