Trait FunctionTypeResolver 

pub trait FunctionTypeResolver: Send + Sync {
    // Required method
    fn resolve_function_type(
        &self,
        name: &str,
        binding: Option<&FunctionBinding>,
        argument_names: &[Option<String>],
        argument_types: &[Option<ColumnType>],
        explicit_variadic: bool,
    ) -> Result<Option<ColumnType>, SQLError>;

    // Provided methods
    fn has_untyped_function(&self, _name: &str) -> bool { ... }
    fn resolve_type_name(
        &self,
        _name: &str,
    ) -> Result<Option<ColumnType>, SQLError> { ... }
    fn resolve_function_overload(
        &self,
        _name: &str,
        _binding: Option<&FunctionBinding>,
        _argument_names: &[Option<String>],
        _argument_types: &[Option<ColumnType>],
        _explicit_variadic: bool,
    ) -> Result<Option<ResolvedFunctionOverload>, SQLError> { ... }
    fn is_scalar_function_binding(
        &self,
        _binding: &FunctionBinding,
    ) -> Result<bool, SQLError> { ... }
    fn resolve_function_overload_with_builtins(
        &self,
        name: &str,
        binding: Option<&FunctionBinding>,
        argument_names: &[Option<String>],
        argument_types: &[Option<ColumnType>],
        explicit_variadic: bool,
        _builtins: &[BuiltinFunctionOverload],
    ) -> Result<Option<ResolvedFunctionOverload>, SQLError> { ... }
    fn resolve_scalar_subquery_type(
        &self,
        _subquery: SubqueryId,
        _outer_schema: &RowSchema,
        _params: &[SQLParam],
    ) -> Result<Option<ColumnType>, SQLError> { ... }
}

Required Methods

fn resolve_function_type( &self, name: &str, binding: Option<&FunctionBinding>, argument_names: &[Option<String>], argument_types: &[Option<ColumnType>], explicit_variadic: bool, ) -> Result<Option<ColumnType>, SQLError>

Provided Methods

fn has_untyped_function(&self, _name: &str) -> bool

Return whether an external runtime callback claims this unbound function name without exposing a declared SQL return type. Such callbacks must retain dispatch precedence instead of being rebound to a same-named built-in overload.

fn resolve_type_name(&self, _name: &str) -> Result<Option<ColumnType>, SQLError>

Resolve a catalog-owned SQL type name that is not represented by the built-in ColumnType::from_sql_name mapping, such as a domain.

fn resolve_function_overload( &self, _name: &str, _binding: Option<&FunctionBinding>, _argument_names: &[Option<String>], _argument_types: &[Option<ColumnType>], _explicit_variadic: bool, ) -> Result<Option<ResolvedFunctionOverload>, SQLError>

Resolve a catalog-backed overload together with the stable binding needed to execute it after built-in and user-defined candidates have been ranked.

fn is_scalar_function_binding( &self, _binding: &FunctionBinding, ) -> Result<bool, SQLError>

Return whether an exact catalog-selected binding can execute in a scalar expression. The conservative default prevents aggregate, procedure, and set-returning routines from being attached to ScalarExpr::Func.

fn resolve_function_overload_with_builtins( &self, name: &str, binding: Option<&FunctionBinding>, argument_names: &[Option<String>], argument_types: &[Option<ColumnType>], explicit_variadic: bool, _builtins: &[BuiltinFunctionOverload], ) -> Result<Option<ResolvedFunctionOverload>, SQLError>

Resolve catalog-backed routines and the supplied built-in overloads as one PostgreSQL candidate set. Implementations with catalog visibility should override this so search-path shadowing and unknown-category selection happen before a winner is chosen.

fn resolve_scalar_subquery_type( &self, _subquery: SubqueryId, _outer_schema: &RowSchema, _params: &[SQLParam], ) -> Result<Option<ColumnType>, SQLError>

Resolve the declared first-column type of a physical scalar-subquery slot when the owning execution context carries its plan arena.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors