Enum ColumnTypeKind 

#[non_exhaustive]
pub enum ColumnTypeKind {
    Builtin,
    Custom,
    Domain,
    Struct,
    Union,
}

Classification of a result column’s declared type.

Returned as part of ColumnTypeInfo. #[non_exhaustive] so that new kinds (e.g. for future enum or table-row types) can be added without a breaking change.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Builtin

A SQLite-style primitive type: INTEGER, TEXT, REAL, BLOB, NUMERIC, ANY. The declared name is itself the primitive.

Custom

A user- or built-in custom type defined with CREATE TYPE name BASE primitive ENCODE ... DECODE .... Has an underlying primitive (see base_type) and an encode/decode pipeline. Built-in types like uuid, boolean, numeric register through this path too.

Domain

A domain defined with CREATE DOMAIN name AS base [CHECK ...]. Shares an underlying primitive with its base type but adds CHECK constraints; values are otherwise identical to the base.

Struct

A composite type defined with CREATE TYPE name AS STRUCT(...). Values are stored as BLOBs containing the packed record; the declared name carries the field schema.

Union

A tagged union defined with CREATE TYPE name AS UNION(...). Values are stored as BLOBs containing a tag and a payload; the declared name carries the variant schema.

Trait Implementations

impl Clone for ColumnTypeKind

fn clone(&self) -> ColumnTypeKind

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for ColumnTypeKind

impl Debug for ColumnTypeKind

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for ColumnTypeKind

impl PartialEq for ColumnTypeKind

fn eq(&self, other: &ColumnTypeKind) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ColumnTypeKind