[branch-53] Add exact HigherOrderSignature#129
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LiaCastaneda merged 1 commit intoMay 26, 2026
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## Which issue does this PR close? No issue — this is a follow-up to apache#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 as well ## Are these changes tested? Yes I added some planning tests for exact siganture in `datafusion/expr/src/type_coercion/functions.rs` ## Are there any user-facing changes? Yes a new signature for HigherOrderSignature was added. (cherry picked from commit fb26fd9)
notfilippo
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May 26, 2026
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cherry-picks #/22326
This change will be included in v54 release