LiaCastaneda opened a new issue, #25017:
URL: https://github.com/apache/datafusion/issues/25017
### Is your feature request related to a problem or challenge?
`e.field` doesn't resolve when `e` is a lambda parameter of struct type, in
both the SQL frontend and the Substrait consumer path. Accessing the same
nested field on an ordinary struct-typed column works fine in both -- this is
specific to lambda-bound variables.
### To Reproduce
```
-- Works: whole lambda parameter, no dotted access. Real field names
-- (rule_number, rule_action) survive into the output type.
SELECT array_transform(
make_array(named_struct('rule_number', 1, 'rule_action', 'allow')),
e -> e
);
-- Fails: dotted access into the lambda parameter's own struct fields.
SELECT array_transform(
make_array(named_struct('rule_number', 1, 'rule_action', 'allow')),
e -> e.rule_action
);
```
The second query fails with `Schema error: No field named e.rule_action`. --
even purely in the SQL planner, no Substrait involved.
### Describe the solution you'd like
Support referencing a field in the struct type inside a lambda (in both
paths)
### Describe alternatives you've considered
_No response_
### Additional context
_No response_
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