MinByNAggregationFunction.java

/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.presto.operator.aggregation;

public class MinByNAggregationFunction
        extends AbstractMinMaxByNAggregationFunction
{
    private static final String NAME = "min_by";

    public static final MinByNAggregationFunction MIN_BY_N_AGGREGATION = new MinByNAggregationFunction();

    public MinByNAggregationFunction()
    {
        super(NAME, t -> ((leftBlock, leftIndex, rightBlock, rightIndex) -> -t.compareTo(leftBlock, leftIndex, rightBlock, rightIndex)));
    }

    @Override
    public String getDescription()
    {
        return  "Returns the values of the first argument associated with the minimum values of the second argument";
    }
}