Enum AnalyticFunctionType 

pub enum AnalyticFunctionType {
    Lag,
    Lead,
    FirstValue,
    LastValue,
    NthValue,
}

Types of analytic window functions.

Variants

Lag

LAG(col, offset, default) — look back offset rows in partition.

Lead

LEAD(col, offset, default) — look ahead offset rows in partition.

FirstValue

FIRST_VALUE(col) OVER (…) — first value in window frame.

LastValue

LAST_VALUE(col) OVER (…) — last value in window frame.

NthValue

NTH_VALUE(col, n) OVER (…) — n-th value in window frame.

Implementations

impl AnalyticFunctionType

pub fn sql_name(&self) -> &'static str

Returns the function name as used in SQL.

pub fn requires_lookahead(&self) -> bool

Returns true if this function requires buffering future events.

Trait Implementations

impl Clone for AnalyticFunctionType

fn clone(&self) -> AnalyticFunctionType

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AnalyticFunctionType

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

Formats the value using the given formatter.

impl Hash for AnalyticFunctionType

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 AnalyticFunctionType

fn eq(&self, other: &AnalyticFunctionType) -> 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 AnalyticFunctionType

impl Eq for AnalyticFunctionType

impl StructuralPartialEq for AnalyticFunctionType