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Deprecate ScalarUDFImpl::return_type #13717

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andygrove wants to merge 4 commits into from
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Deprecate ScalarUDFImpl::return_type #13717

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e17342c
Deprecate ScalarUDFImpl::return_type and revert a breaking API change
andygrove Dec 10, 2024
b64cf14
clippy
andygrove Dec 10, 2024
97b037b
revert change
andygrove Dec 11, 2024
4e08770
address feedback
andygrove Dec 11, 2024
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4 changes: 4 additions & 0 deletions datafusion/expr/src/udf.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -174,6 +174,7 @@ impl ScalarUDF {
///
/// See [`ScalarUDFImpl::return_type`] for more details.
pub fn return_type(&self, arg_types: &[DataType]) -> Result<DataType> {
#[allow(deprecated)]
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@findepi findepi Dec 11, 2024

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Shouldn't we also deprecate this (ScalarUDF::return_type) method if we deprecate underlying ScalarUDFImpl method?

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@alamb alamb Dec 11, 2024

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Yes

self.inner.return_type(arg_types)
}

Expand Down Expand Up @@ -450,6 +451,7 @@ pub trait ScalarUDFImpl: Debug + Send + Sync {
/// is recommended to return [`DataFusionError::Internal`].
///
/// [`DataFusionError::Internal`]: datafusion_common::DataFusionError::Internal
#[deprecated(since = "44.0.0", note = "Use `return_type_from_exprs` instead")]
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@alamb alamb Dec 11, 2024

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if we are going to deprecate this API I think we should add an example to return_type_from_exprs to help the migration effort.

I can help if we proceed

fn return_type(&self, arg_types: &[DataType]) -> Result<DataType>;

/// What [`DataType`] will be returned by this function, given the
Expand Down Expand Up @@ -483,6 +485,7 @@ pub trait ScalarUDFImpl: Debug + Send + Sync {
_schema: &dyn ExprSchema,
arg_types: &[DataType],
) -> Result<DataType> {
#[allow(deprecated)]
self.return_type(arg_types)
}

Expand Down Expand Up @@ -756,6 +759,7 @@ impl ScalarUDFImpl for AliasedScalarUDFImpl {
}

fn return_type(&self, arg_types: &[DataType]) -> Result<DataType> {
#[allow(deprecated)]
self.inner.return_type(arg_types)
}

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1 change: 1 addition & 0 deletions datafusion/functions/src/string/concat.rs
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Expand Up @@ -305,6 +305,7 @@ pub fn simplify_concat(args: Vec<Expr>) -> Result<ExprSimplifyResult> {
_ => None,
})
.collect();
#[allow(deprecated)]
ConcatFunc::new().return_type(&data_types)
}?;

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