Enum AggregateFunc 

pub enum AggregateFunc {
    MaxInt16,
    MaxInt32,
    MaxInt64,
    MaxUInt16,
    MaxUInt32,
    MaxUInt64,
    MaxFloat32,
    MaxFloat64,
    MaxBool,
    MaxString,
    MaxDate,
    MaxDateTime,
    MaxTimestamp,
    MaxTime,
    MaxDuration,
    MaxInterval,
    MinInt16,
    MinInt32,
    MinInt64,
    MinUInt16,
    MinUInt32,
    MinUInt64,
    MinFloat32,
    MinFloat64,
    MinBool,
    MinString,
    MinDate,
    MinDateTime,
    MinTimestamp,
    MinTime,
    MinDuration,
    MinInterval,
    SumInt16,
    SumInt32,
    SumInt64,
    SumUInt16,
    SumUInt32,
    SumUInt64,
    SumFloat32,
    SumFloat64,
    Count,
    Any,
    All,
}

Aggregate functions that can be applied to a group of rows.

Mean function is deliberately not included as it can be computed from Sum and Count, whose state can be better managed.

type of the input and output of the aggregate function:

sum(i*)->i64, sum(u*)->u64

count()->i64

min/max(T)->T

Variants

MaxInt16

MaxInt32

MaxInt64

MaxUInt16

MaxUInt32

MaxUInt64

MaxFloat32

MaxFloat64

MaxBool

MaxString

MaxDate

MaxDateTime

MaxTimestamp

MaxTime

MaxDuration

MaxInterval

MinInt16

MinInt32

MinInt64

MinUInt16

MinUInt32

MinUInt64

MinFloat32

MinFloat64

MinBool

MinString

MinDate

MinDateTime

MinTimestamp

MinTime

MinDuration

MinInterval

SumInt16

SumInt32

SumInt64

SumUInt16

SumUInt32

SumUInt64

SumFloat32

SumFloat64

Count

Any

All

Implementations

impl AggregateFunc

pub fn is_max(&self) -> bool

if this function is a max

pub fn is_min(&self) -> bool

if this function is a min

pub fn eval_diff_accumulable<A, I>( &self, accum: A, value_diffs: I, ) -> Result<(Value, Vec<Value>), EvalError>

where A: IntoIterator<Item = Value>, I: IntoIterator<Item = (Value, i64)>,

Eval value, diff with accumulator

Expect self to be accumulable aggregate function, i.e. sum/count

TODO(discord9): deal with overflow&better accumulator

pub fn eval_batch<A>( &self, accum: A, vector: VectorRef, diff: Option<VectorRef>, ) -> Result<(Value, Vec<Value>), EvalError>

where A: IntoIterator<Item = Value>,

return output value and new accumulator state

impl AggregateFunc

pub fn from_str_and_type( name: &str, arg_type: Option<ConcreteDataType>, ) -> Result<Self, Error>

Create a AggregateFunc from a string of the function name and given argument type(optional) given an None type will be treated as null type, which in turn for AggregateFunc like Count will be treated as any type

pub fn signature(&self) -> Signature

all concrete datatypes with precision types will be returned with largest possible variant as a exception, count have a signature of null -> i64, but it’s actually anytype -> i64

TODO(discorcd9): fix signature for sum unsign -> u64 sum signed -> i64

Trait Implementations

impl Clone for AggregateFunc

fn clone(&self) -> AggregateFunc

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AggregateFunc

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for AggregateFunc

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for AggregateFunc

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 IntoEnumIterator for AggregateFunc

type Iterator = AggregateFuncIter

fn iter() -> AggregateFuncIter

impl Ord for AggregateFunc

fn cmp(&self, other: &AggregateFunc) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for AggregateFunc

fn eq(&self, other: &AggregateFunc) -> 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 PartialOrd for AggregateFunc

fn partial_cmp(&self, other: &AggregateFunc) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for AggregateFunc

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for AggregateFunc

impl StructuralPartialEq for AggregateFunc