Module aggregate_fn 

Aggregate function vtable machinery.

This module contains the AggregateFnVTable trait, the Accumulator trait, and the type-erasure infrastructure for aggregate functions.

Modules

combined

Generic adapter for aggregates whose result is computed from two child aggregate functions, e.g. Mean = Sum / Count.

fns

kernels

Pluggable aggregate function kernels used to provide encoding-specific implementations of aggregate functions.

proto

session

Structs

Accumulator

An accumulator used for computing aggregates over an entire stream of arrays.

AggregateArgs

The options and resolved dtypes passed to every aggregate execution method.

AggregateDTypes

Resolved dtypes of one aggregate function bound to its options and input.

AggregateFn

A typed aggregate function instance, parameterized by a concrete AggregateFnVTable.

AggregateFnOptions

An opaque handle to aggregate function options.

AggregateFnRef

A type-erased aggregate function, pairing a vtable with bound options behind a trait object.

EmptyOptions

GroupedAccumulator

An accumulator used for computing grouped aggregates.

NumericalAggregateOpts

Options for aggregate functions over primitive numeric inputs, controlling how NaN values in floating-point arrays are handled.

Enums

AggregateFnSatisfaction

Whether a stored aggregate function can satisfy a requested aggregate function.

GroupRanges

The physical ranges of a grouped array.

GroupedArray

A batch of grouped values to aggregate.

Traits

AggregateFnPlugin

Registry trait for ID-based deserialization of aggregate functions.

AggregateFnVTable

Defines the interface for aggregate function vtables.

AggregateFnVTableExt

Factory functions for aggregate vtables.

DynAccumulator

A trait object for type-erased accumulators, used for dynamic dispatch when the aggregate function is not known at compile time.

DynGroupedAccumulator

A trait object for type-erased grouped accumulators, used for dynamic dispatch when the aggregate function is not known at compile time.

Type Aliases

AccumulatorRef

Reference-counted type-erased accumulator.

AggregateFnId

A unique identifier for an aggregate function.

AggregateFnPluginRef

Reference-counted pointer to an aggregate function plugin.

GroupedAccumulatorRef

Reference-counted type-erased grouped accumulator.