com.hazelcast.org.apache.calcite.adapter.enumerable.AggregateLambdaFactory Maven / Gradle / Ivy
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* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you under the Apache License, Version 2.0
* (the "License"); you may not use this file except in com.hazelcast.com.liance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.org.licenses/LICENSE-2.0
*
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package com.hazelcast.org.apache.calcite.adapter.enumerable;
import com.hazelcast.org.apache.calcite.linq4j.function.Function0;
import com.hazelcast.org.apache.calcite.linq4j.function.Function1;
import com.hazelcast.org.apache.calcite.linq4j.function.Function2;
/**
* Generates lambda functions used in {@link EnumerableAggregate}.
*
* This interface allows a implicit accumulator type variation.
* ({@code OAccumulate} {@literal ->} {@code TAccumulate})
*
* @param Type of the enumerable input source
* @param Type of the original accumulator
* @param Type of the varied accumulator
* @param Type of the enumerable output result
* @param Type of the group-by key
*/
public interface AggregateLambdaFactory {
Function0 accumulatorInitializer();
Function2 accumulatorAdder();
Function1 singleGroupResultSelector(
Function1 resultSelector);
Function2 resultSelector(
Function2 resultSelector);
}