Package com.facebook.presto.operator.aggregation

Source Code of com.facebook.presto.operator.aggregation.TestDoubleAverageAggregation

/*
* 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;

import com.facebook.presto.block.Block;
import com.facebook.presto.block.BlockBuilder;

import static com.facebook.presto.operator.aggregation.AverageAggregations.DOUBLE_AVERAGE;
import static com.facebook.presto.tuple.TupleInfo.SINGLE_DOUBLE;

public class TestDoubleAverageAggregation
        extends AbstractTestAggregationFunction
{
    @Override
    public Block getSequenceBlock(int start, int length)
    {
        BlockBuilder blockBuilder = new BlockBuilder(SINGLE_DOUBLE);
        for (int i = start; i < start + length; i++) {
            blockBuilder.append((double) i);
        }
        return blockBuilder.build();
    }

    @Override
    public AggregationFunction getFunction()
    {
        return DOUBLE_AVERAGE;
    }

    @Override
    public Number getExpectedValue(int start, int length)
    {
        if (length == 0) {
            return null;
        }

        double sum = 0;
        for (int i = start; i < start + length; i++) {
            sum += i;
        }
        return sum / length;
    }
}
TOP

Related Classes of com.facebook.presto.operator.aggregation.TestDoubleAverageAggregation

TOP
Copyright © 2018 www.massapi.com. All rights reserved.
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.