Struct ColumnDef 

pub struct ColumnDef {
    pub name: String,
    pub data_type: DataType,
    pub nullable: bool,
    pub default: Option<Vec<u8>>,
    pub vector_dim: Option<u32>,
    pub compress: bool,
    pub enum_variants: Vec<String>,
    pub decimal_precision: u8,
    pub element_type: Option<DataType>,
    pub metadata: HashMap<String, String>,
}

Column definition

Fields

name: String

Column name

data_type: DataType

Data type

nullable: bool

Whether NULL values are allowed

default: Option<Vec<u8>>

Default value (serialized)

vector_dim: Option<u32>

Vector dimension (for Vector type)

compress: bool

Whether to compress this column’s data (e.g., brotli for text)

enum_variants: Vec<String>

For Enum type: list of valid variants

decimal_precision: u8

For Decimal type: number of decimal places (default 4)

element_type: Option<DataType>

For Array type: element data type

metadata: HashMap<String, String>

Additional column metadata

Implementations

impl ColumnDef

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

Create a new column definition

pub fn not_null(self) -> Self

Create a non-nullable column

pub fn with_default(self, default: Vec<u8>) -> Self

Set default value

pub fn with_vector_dim(self, dim: u32) -> Self

Set vector dimension

pub fn with_metadata( self, key: impl Into<String>, value: impl Into<String>, ) -> Self

Add metadata

pub fn compressed(self) -> Self

Enable per-column compression

pub fn with_variants(self, variants: Vec<String>) -> Self

Set enum variants (for Enum type columns)

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

Set decimal precision (for Decimal type columns)

pub fn with_element_type(self, dt: DataType) -> Self

Set element type (for Array type columns)

Trait Implementations

impl Clone for ColumnDef

fn clone(&self) -> ColumnDef

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnDef

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

Formats the value using the given formatter.

impl Display for ColumnDef

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

Formats the value using the given formatter.