renato2099 commented on issue #17630:
URL: https://github.com/apache/datafusion/issues/17630#issuecomment-3304581352
I think I found the issue, basically the window expr representation uses an
unqualifed string
```
window_fn_str: Some("lag(a, Int64(1), NULL) ROWS BETWEEN UNBOUNDED PRECEDING
AND UNBOUNDED FOLLOWING")
```
whereas the field over which we iterate does use a qualified string
```
field.name "lag(t.a,Int64(1),NULL) ROWS BETWEEN UNBOUNDED PRECEDING AND
UNBOUNDED FOLLOWING"
```
I am still looking on the best way to deal with this
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