Enum NullHandling 

pub enum NullHandling {
    First,
    Last,
}

Describes how NULL values should be ordered when sorting. We refer to None values returned from PartialOrdBy::partial_cmp_by as NULL. Warning: Rust’s Option::None is not strictly equivalent to SQL’s NULL but we borrow from SQL terminology to handle them.

Variants

First

Places all NULL values first.

Last

Places all NULL values last. The default.

Trait Implementations

impl Clone for NullHandling

fn clone(&self) -> NullHandling

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NullHandling

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

Formats the value using the given formatter.

impl Default for NullHandling

fn default() -> NullHandling

Returns the “default value” for a type.

impl PartialEq for NullHandling

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for NullHandling

impl StructuralPartialEq for NullHandling