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ArrayAggPartial

nodedb_cluster::distributed_array::merge

Struct ArrayAggPartial 

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pub struct ArrayAggPartial {
    pub group_key: i64,
    pub count: u64,
    pub sum: f64,
    pub min: f64,
    pub max: f64,
    pub welford_mean: f64,
    pub welford_m2: f64,
}
Expand description

Partial aggregate contributed by a single shard for one group-by bucket.

Carries enough state for all supported reducers (SUM, COUNT, MIN, MAX, MEAN). Welford fields enable variance/stddev if a future reducer needs it.

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§group_key: i64

Group-by dimension value, or 0 when group_by_dim < 0 (scalar aggregate).

§count: u64§sum: f64§min: f64§max: f64§welford_mean: f64

Welford mean — enables MEAN without a second pass.

§welford_m2: f64

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impl ArrayAggPartial

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pub fn from_single(group_key: i64, val: f64) -> Self

Create from a single cell value.

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pub fn merge(&mut self, other: &ArrayAggPartial)

Merge another partial into this one using parallel Welford.

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impl Clone for ArrayAggPartial

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fn clone(&self) -> ArrayAggPartial

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for ArrayAggPartial

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

Formats the value using the given formatter. Read more
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impl<'de> Deserialize<'de> for ArrayAggPartial

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl<'__msgpack_de> FromMessagePack<'__msgpack_de> for ArrayAggPartial

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fn read<R: Read<'__msgpack_de>>(reader: &mut R) -> Result<Self, Error>
where Self: Sized,

Reads the MessagePack representation of this value from the provided reader.
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impl Serialize for ArrayAggPartial

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

Serialize this value into the given Serde serializer. Read more
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impl ToMessagePack for ArrayAggPartial

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fn write<W: Write>(&self, writer: &mut W) -> Result<(), Error>

Writes the MessagePack representation of this value into the provided writer.

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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