alamb commented on issue #21231:
URL: https://github.com/apache/datafusion/issues/21231#issuecomment-4372693252
I think a classic way to implement this type of resolution is using a stack
of named scope / bindings.
So that would be something like
```
(Query Bindings (column references)
-> Local Scope Bindings (any newly defined references)
...
-> nested Scope Bindings for a nested lambda, for exampe (any newly
defined references)
```
So then when we went to resolve a mapping `"a"` to a column index it would
look back in the stack of scope bindings.
When the recursion passes a lambda function, it would push a new scope on ot
the stack and pop off the stack when done
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