Trait SqlContainerType 

pub trait SqlContainerType {
    // Required methods
    fn unwrap_element_type(container: &SqlScalarType) -> &SqlScalarType;
    fn wrap_element_type(element: SqlScalarType) -> SqlScalarType;
}

Trait for SQL container types whose element/value type can be extracted from or wrapped into a SqlScalarType.

Implemented by DatumList, Array, DatumMap, and Range. The #[sqlfunc] proc macro emits calls to these associated functions so that Rust’s type system resolves the correct unwrap/wrap behavior at compile time, instead of relying on string-matching type names in the AST.

The methods are deliberately associated functions (no &self) because they operate on SqlScalarType metadata, not on container values.

Required Methods

fn unwrap_element_type(container: &SqlScalarType) -> &SqlScalarType

Extract the element type from a container scalar type.

fn wrap_element_type(element: SqlScalarType) -> SqlScalarType

Construct a container scalar type from an element type.

Dyn Compatibility

This trait is not dyn compatible.

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

Implementors

impl SqlContainerType for Range<Datum<'_>>

impl<'a> SqlContainerType for Array<'a, Datum<'a>>

impl<'a> SqlContainerType for DatumList<'a, Datum<'a>>

impl<'a> SqlContainerType for DatumMap<'a, Datum<'a>>