LiaCastaneda opened a new pull request, #22326:
URL: https://github.com/apache/datafusion/pull/22326
## Which issue does this PR close?
No issue — this is a follow-up to #21679.
## Rationale for this change
In `ScalarUDF`, arity is enforced by the framework via `TypeSignature`. In
`HigherOrderUDF`, functions with a fixed number of value and lambda arguments
had to use `UserDefined` and manually validate arity inside
`coerce_value_types`, which is boilerplate that every implementor has to repeat.
## What changes are included in this PR?
Adds `HigherOrderTypeSignature::Exact { values: usize, lambdas: usize }
`variant that enforces a fixed count of value and lambda arguments, calling
coerce_value_types only for type coercion
## Are these changes tested?
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## Are there any user-facing changes?
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