Struct SchemaColumn 

pub struct SchemaColumn {

    pub id: usize,
    pub name: String,
    pub data_type: DataType,
    pub external_type: Option<ExternalTypeRef>,
    pub external_type_name: Option<String>,
    pub nullable: bool,
    pub primary_key: bool,
    pub auto_increment: bool,
    pub default_expr: Option<String>,
    pub default_value: Option<Value>,
    pub check_expr: Option<String>,
    pub vector_dimensions: u16,
    pub decimal_precision: u8,
    pub decimal_scale: u8,
    /* private fields */
}

A column definition in a table schema

Fields

id: usize

Unique identifier for the column (0-based index)

name: String

Column name

data_type: DataType

Data type of the column

external_type: Option<ExternalTypeRef>

Stable external type identity. Built-in columns keep this empty.

external_type_name: Option<String>

Schema-qualified SQL type name used by introspection and dump output.

nullable: bool

Whether the column can contain NULL values

primary_key: bool

Whether this column is part of the primary key

auto_increment: bool

Whether this column auto-increments (generates sequential IDs for NULL values)

default_expr: Option<String>

Default value expression as a string (to be parsed and evaluated during INSERT)

default_value: Option<Value>

Pre-computed default value for schema evolution (used when adding column to existing rows)

check_expr: Option<String>

CHECK constraint expression as a string (to be parsed and evaluated during INSERT)

vector_dimensions: u16

Number of dimensions for VECTOR columns (0 = not a vector column)

decimal_precision: u8

Declared precision for DECIMAL columns (0 = unconstrained DECIMAL).

decimal_scale: u8

Declared scale for DECIMAL columns. This is zero when precision is zero.

Implementations

impl SchemaColumn

pub fn new( id: usize, name: impl Into<String>, data_type: DataType, nullable: bool, primary_key: bool, ) -> Self

Create a new column definition

pub fn with_vector_dimensions(self, dims: u16) -> Self

Set vector dimensions (for VECTOR columns)

pub fn with_decimal_parameters(self, precision: u8, scale: u8) -> Self

Set exact DECIMAL(p,s) column parameters. A precision of zero denotes the unparameterized DECIMAL domain and requires scale zero.

pub fn with_external_type( self, type_ref: ExternalTypeRef, sql_name: impl Into<String>, ) -> Self

pub const fn logical_type(&self) -> LogicalTypeRef

pub fn formatted_data_type(&self) -> String

Render the complete declared SQL type, including durable modifiers.

pub fn has_same_declared_type(&self, other: &Self) -> bool

Exact schema-level type identity used by references and descriptors.

pub fn validate_declared_value(&self, value: &Value) -> Result<()>

Validate value-level modifiers that are not represented by DataType. The value is not rewritten: exact decimal payload bytes remain intact.

pub fn with_constraints( id: usize, name: impl Into<String>, data_type: DataType, nullable: bool, primary_key: bool, auto_increment: bool, default_expr: Option<String>, check_expr: Option<String>, ) -> Self

Create a new column definition with all options

pub fn with_default_value( id: usize, name: impl Into<String>, data_type: DataType, nullable: bool, primary_key: bool, auto_increment: bool, default_expr: Option<String>, default_value: Option<Value>, check_expr: Option<String>, ) -> Self

Create a new column definition with pre-computed default value

pub fn simple(id: usize, name: impl Into<String>, data_type: DataType) -> Self

Create a simple non-nullable, non-primary-key column

pub fn nullable(id: usize, name: impl Into<String>, data_type: DataType) -> Self

Create a nullable column

pub fn primary_key( id: usize, name: impl Into<String>, data_type: DataType, ) -> Self

Create a primary key column

Trait Implementations

impl Clone for SchemaColumn

fn clone(&self) -> SchemaColumn

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SchemaColumn

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

Formats the value using the given formatter.

impl Display for SchemaColumn

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

Formats the value using the given formatter.

impl Eq for SchemaColumn

impl PartialEq for SchemaColumn

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SchemaColumn