Enum FromFirstLast 

pub enum FromFirstLast {
    First,
    Last,
}

FROM FIRST / FROM LAST — which end of the window frame NTH_VALUE counts its Nth row from (SQL:2016 from_first_last).

Two spellings of the same construct kept as data so the surface round-trips (the NullTreatment precedent). FROM FIRST is the default; FROM LAST completes the surface for a dialect that admits it (mysql:8 feature-rejects it, so its parser only ever produces First).

Variants

First

FROM FIRST — count from the first row of the frame (the default).

Last

FROM LAST — count from the last row of the frame.

Trait Implementations

impl Clone for FromFirstLast

fn clone(&self) -> FromFirstLast

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FromFirstLast

impl Debug for FromFirstLast

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for FromFirstLast

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for FromFirstLast

impl Hash for FromFirstLast

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for FromFirstLast

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for FromFirstLast

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 FromFirstLast