Struct LiteralExpression

pub struct LiteralExpression {
    return_type: DataType,
    literal: Datum,
}

A literal expression.

Fields

return_type: DataType

literal: Datum

Implementations

impl LiteralExpression

pub fn new(return_type: DataType, literal: Datum) -> Self

pub fn literal(&self) -> Datum

Trait Implementations

impl Build for LiteralExpression

fn build( prost: &ExprNode, _build_child: impl Fn(&ExprNode) -> Result<BoxedExpression>, ) -> Result<Self>

Build the expression Self from protobuf.

impl Clone for LiteralExpression

fn clone(&self) -> LiteralExpression

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for LiteralExpression

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

Formats the value using the given formatter.

impl Expression for LiteralExpression

fn return_type(&self) -> DataType

Get the return data type.

fn eval_v2<'life0, 'life1, 'async_trait>( &'life0 self, input: &'life1 DataChunk, ) -> Pin<Box<dyn Future<Output = Result<ValueImpl>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Evaluate the expression in vectorized execution. Returns a value that can be either an array, or a scalar if all values in the array are the same.

fn eval_row<'life0, 'life1, 'async_trait>( &'life0 self, _input: &'life1 OwnedRow, ) -> Pin<Box<dyn Future<Output = Result<Datum>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Evaluate the expression in row-based execution. Returns a nullable scalar.

fn eval_const(&self) -> Result<Datum>

Evaluate if the expression is constant.

fn eval<'life0, 'life1, 'async_trait>( &'life0 self, input: &'life1 DataChunk, ) -> Pin<Box<dyn Future<Output = Result<ArrayRef>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Evaluate the expression in vectorized execution. Returns an array.

fn input_ref_index(&self) -> Option<usize>

Get the index if the expression is an InputRef.