Enum TwoPhaseKind 

pub enum TwoPhaseKind {
    Count,
    Sum,
    Avg,
    Min,
    Max,
    ApproxDistinct,
}

Aggregate function kind that supports two-phase execution.

Variants

Count

COUNT aggregate.

Sum

SUM aggregate.

Avg

AVG aggregate (carried as sum + count).

Min

MIN aggregate.

Max

MAX aggregate.

ApproxDistinct

Approximate distinct count via HyperLogLog.

Implementations

impl TwoPhaseKind

pub fn from_name(name: &str) -> Option<Self>

Resolve a function kind from its SQL name.

Examples

use laminar_core::aggregation::two_phase::TwoPhaseKind;

assert_eq!(TwoPhaseKind::from_name("COUNT"), Some(TwoPhaseKind::Count));
assert_eq!(TwoPhaseKind::from_name("avg"), Some(TwoPhaseKind::Avg));
assert_eq!(TwoPhaseKind::from_name("MEDIAN"), None);

Trait Implementations

impl Clone for TwoPhaseKind

fn clone(&self) -> TwoPhaseKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TwoPhaseKind

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for TwoPhaseKind

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for TwoPhaseKind

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 TwoPhaseKind

fn eq(&self, other: &TwoPhaseKind) -> 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 Serialize for TwoPhaseKind

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for TwoPhaseKind

impl Eq for TwoPhaseKind

impl StructuralPartialEq for TwoPhaseKind