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

fns

kernels

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

session

Structs

Accumulator

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

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.

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.