Trait LazyVariadicFunc 

pub(crate) trait LazyVariadicFunc: Display {
    // Required methods
    fn eval<'a>(
        &'a self,
        datums: &[Datum<'a>],
        temp_storage: &'a RowArena,
        exprs: &'a [MirScalarExpr],
    ) -> Result<Datum<'a>, EvalError>;
    fn output_type(&self, input_types: &[SqlColumnType]) -> SqlColumnType;
    fn propagates_nulls(&self) -> bool;
    fn introduces_nulls(&self) -> bool;

    // Provided methods
    fn could_error(&self) -> bool { ... }
    fn is_monotone(&self) -> bool { ... }
    fn is_associative(&self) -> bool { ... }
    fn is_infix_op(&self) -> bool { ... }
}

Required Methods

fn eval<'a>( &'a self, datums: &[Datum<'a>], temp_storage: &'a RowArena, exprs: &'a [MirScalarExpr], ) -> Result<Datum<'a>, EvalError>

fn output_type(&self, input_types: &[SqlColumnType]) -> SqlColumnType

The output SqlColumnType of this function.

fn propagates_nulls(&self) -> bool

Whether this function will produce NULL on NULL input.

fn introduces_nulls(&self) -> bool

Whether this function will produce NULL on non-NULL input.

Provided Methods

fn could_error(&self) -> bool

Whether this function might error on non-error input.

fn is_monotone(&self) -> bool

Returns true if the function is monotone.

fn is_associative(&self) -> bool

Returns true if the function is associative.

fn is_infix_op(&self) -> bool

Returns true if the function is an infix operator.

Implementors

impl LazyVariadicFunc for And

impl LazyVariadicFunc for Coalesce

impl LazyVariadicFunc for ErrorIfNull

impl LazyVariadicFunc for Greatest

impl LazyVariadicFunc for Least

impl LazyVariadicFunc for Or

impl<T: EagerVariadicFunc> LazyVariadicFunc for T

Blanket LazyVariadicFunc impl for each eager type, bridging expression evaluation and null propagation via InputDatumType::try_from_iter.