Struct ComputedColumn 

pub struct ComputedColumn {
    pub name: String,
    pub expression_sql: String,
}

Declares a computed column to add during schema evolution.

Expression acceptance depends on the selected backend; this DTO does not define one expression language that every implementation accepts. Schema evolution remains an optional catalog operation. The supplied Lance implementation eagerly fills existing rows from the SQL expression before returning completion. This portable DTO does not declare an upstream deferred computed column or promise recomputation after later writes.

Examples

let column = storage_kit::database::catalog::ComputedColumn {
    name: "summary_len".into(),
    expression_sql: "length(summary)".into(),
};
assert_eq!(column.name, "summary_len");

Fields

name: String

Column name that will be added to the collection schema.

expression_sql: String

SQL expression used to compute the column.

Trait Implementations

impl Clone for ComputedColumn

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ComputedColumn

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ComputedColumn

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for ComputedColumn

impl PartialEq for ComputedColumn

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for ComputedColumn

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for ComputedColumn