com.hazelcast.jet.sql.impl.aggregate.SqlAggregation Maven / Gradle / Ivy
/*
* Copyright 2021 Hazelcast Inc.
*
* Licensed under the Hazelcast Community License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://hazelcast.com/hazelcast-community-license
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.jet.sql.impl.aggregate;
import com.hazelcast.nio.serialization.DataSerializable;
/**
* A mutable object used for computing the SQL aggregation functions.
*/
public interface SqlAggregation extends DataSerializable {
/**
* Accumulate a value from a single row into this instance.
*/
void accumulate(Object value);
/**
* Merge another aggregation into this aggregation.
*/
void combine(SqlAggregation other);
/**
* Return the aggregation result.
*/
Object collect();
}
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