org.apache.calcite.adapter.enumerable

Class LazyAggregateLambdaFactory<TSource,TKey,TOrigAccumulate,TResult>

java.lang.Object

org.apache.calcite.adapter.enumerable.LazyAggregateLambdaFactory<TSource,TKey,TOrigAccumulate,TResult>

Type Parameters:

TSource - Type of the enumerable input source

TKey - Type of the group-by key

TOrigAccumulate - Type of the original accumulator

TResult - Type of the enumerable output result

All Implemented Interfaces:

AggregateLambdaFactory<TSource,TOrigAccumulate,LazyAggregateLambdaFactory.LazySource<TSource>,TResult,TKey>

public class LazyAggregateLambdaFactory<TSource,TKey,TOrigAccumulate,TResult>
extends Object
implements AggregateLambdaFactory<TSource,TOrigAccumulate,LazyAggregateLambdaFactory.LazySource<TSource>,TResult,TKey>

Generate aggregate lambdas that preserve the input source before calling each aggregate adder, this implementation is generally used when we need to sort the input before performing aggregation.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	LazyAggregateLambdaFactory.LazyAccumulator<TOrigAccumulate,TSource> Accumulate on the cached input sources.
static class	LazyAggregateLambdaFactory.LazySource<TSource> Cache the input sources.

Constructor Summary

Constructors

Constructor and Description
LazyAggregateLambdaFactory(org.apache.calcite.linq4j.function.Function0<TOrigAccumulate> accumulatorInitializer, List<LazyAggregateLambdaFactory.LazyAccumulator<TOrigAccumulate,TSource>> accumulators)

Method Summary

Modifier and Type	Method and Description
org.apache.calcite.linq4j.function.Function2<LazyAggregateLambdaFactory.LazySource<TSource>,TSource,LazyAggregateLambdaFactory.LazySource<TSource>>	accumulatorAdder()
org.apache.calcite.linq4j.function.Function0<LazyAggregateLambdaFactory.LazySource<TSource>>	accumulatorInitializer()
org.apache.calcite.linq4j.function.Function2<TKey,LazyAggregateLambdaFactory.LazySource<TSource>,TResult>	resultSelector(org.apache.calcite.linq4j.function.Function2<TKey,TOrigAccumulate,TResult> resultSelector)
org.apache.calcite.linq4j.function.Function1<LazyAggregateLambdaFactory.LazySource<TSource>,TResult>	singleGroupResultSelector(org.apache.calcite.linq4j.function.Function1<TOrigAccumulate,TResult> resultSelector)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LazyAggregateLambdaFactory

public LazyAggregateLambdaFactory(org.apache.calcite.linq4j.function.Function0<TOrigAccumulate> accumulatorInitializer,
                                  List<LazyAggregateLambdaFactory.LazyAccumulator<TOrigAccumulate,TSource>> accumulators)

Method Detail

accumulatorInitializer

public org.apache.calcite.linq4j.function.Function0<LazyAggregateLambdaFactory.LazySource<TSource>> accumulatorInitializer()

Specified by:

accumulatorInitializer in interface AggregateLambdaFactory<TSource,TOrigAccumulate,LazyAggregateLambdaFactory.LazySource<TSource>,TResult,TKey>

accumulatorAdder

public org.apache.calcite.linq4j.function.Function2<LazyAggregateLambdaFactory.LazySource<TSource>,TSource,LazyAggregateLambdaFactory.LazySource<TSource>> accumulatorAdder()

Specified by:

accumulatorAdder in interface AggregateLambdaFactory<TSource,TOrigAccumulate,LazyAggregateLambdaFactory.LazySource<TSource>,TResult,TKey>

singleGroupResultSelector

public org.apache.calcite.linq4j.function.Function1<LazyAggregateLambdaFactory.LazySource<TSource>,TResult> singleGroupResultSelector(org.apache.calcite.linq4j.function.Function1<TOrigAccumulate,TResult> resultSelector)

Specified by:

singleGroupResultSelector in interface AggregateLambdaFactory<TSource,TOrigAccumulate,LazyAggregateLambdaFactory.LazySource<TSource>,TResult,TKey>

resultSelector

public org.apache.calcite.linq4j.function.Function2<TKey,LazyAggregateLambdaFactory.LazySource<TSource>,TResult> resultSelector(org.apache.calcite.linq4j.function.Function2<TKey,TOrigAccumulate,TResult> resultSelector)

Specified by:

resultSelector in interface AggregateLambdaFactory<TSource,TOrigAccumulate,LazyAggregateLambdaFactory.LazySource<TSource>,TResult,TKey>