Module udaf 

AggregateUDF: User Defined Aggregate Functions

Structs

AggregateUDF

Logical representation of a user-defined aggregate function (UDAF).

AliasedAggregateUDFImpl 🔒

AggregateUDF that adds an alias to the underlying function. It is better to implement AggregateUDFImpl, which supports aliases, directly if possible.

StatisticsArgs

Arguments passed to AggregateUDFImpl::value_from_stats

Enums

ReversedUDAF

SetMonotonicity

Indicates whether an aggregation function is monotonic as a set function. A set function is monotonically increasing if its value increases as its argument grows (as a set). Formally, f is a monotonically increasing set function if f(S) >= f(T) whenever S is a superset of T.

Traits

AggregateUDFImpl

Trait for implementing AggregateUDF.

Functions

udaf_default_display_name

Encapsulates default implementation of AggregateUDFImpl::display_name.

udaf_default_human_display

Encapsulates default implementation of AggregateUDFImpl::human_display.

udaf_default_return_field

Encapsulates default implementation of AggregateUDFImpl::return_field.

udaf_default_schema_name

Encapsulates default implementation of AggregateUDFImpl::schema_name.

udaf_default_window_function_display_name

Encapsulates default implementation of AggregateUDFImpl::window_function_display_name.

udaf_default_window_function_schema_name

Encapsulates default implementation of AggregateUDFImpl::window_function_schema_name.