Package org.apache.calcite.adapter.enumerable

Interface AggregateLambdaFactory<TSource,TOrigAccumulate,TAccumulate,TResult,TKey>

Type Parameters:

TSource - Type of the enumerable input source

TOrigAccumulate - Type of the original accumulator

TAccumulate - Type of the varied accumulator

TResult - Type of the enumerable output result

TKey - Type of the group-by key

All Known Implementing Classes:

OrderedAggregateLambdaFactory, SequencedAdderAggregateLambdaFactory

public interface AggregateLambdaFactory<TSource,TOrigAccumulate,TAccumulate,TResult,TKey>

Generates lambda functions used in EnumerableAggregate.

This interface allows a implicit accumulator type variation. (OAccumulate -> TAccumulate)

Method Summary

Modifier and Type	Method	Description
Function2<TAccumulate,TSource,TAccumulate>	accumulatorAdder()
Function0<TAccumulate>	accumulatorInitializer()
Function2<TKey,TAccumulate,TResult>	resultSelector(Function2<TKey,TOrigAccumulate,TResult> resultSelector)
Function1<TAccumulate,TResult>	singleGroupResultSelector(Function1<TOrigAccumulate,TResult> resultSelector)

Method Detail

accumulatorInitializer

Function0<TAccumulate> accumulatorInitializer()

accumulatorAdder

Function2<TAccumulate,TSource,TAccumulate> accumulatorAdder()

singleGroupResultSelector

Function1<TAccumulate,TResult> singleGroupResultSelector(Function1<TOrigAccumulate,TResult> resultSelector)

resultSelector

Function2<TKey,TAccumulate,TResult> resultSelector(Function2<TKey,TOrigAccumulate,TResult> resultSelector)