/*
* 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.operator.aggregation.state.NullableDoubleState;
import com.facebook.presto.spi.block.BlockBuilder;
import com.facebook.presto.spi.function.AggregationFunction;
import com.facebook.presto.spi.function.AggregationState;
import com.facebook.presto.spi.function.CombineFunction;
import com.facebook.presto.spi.function.InputFunction;
import com.facebook.presto.spi.function.OutputFunction;
import com.facebook.presto.spi.function.SqlType;
import com.facebook.presto.spi.type.DoubleType;
import com.facebook.presto.spi.type.StandardTypes;
@AggregationFunction("sum")
public final class DoubleSumAggregation
{
private DoubleSumAggregation() {}
@InputFunction
public static void sum(@AggregationState NullableDoubleState state, @SqlType(StandardTypes.DOUBLE) double value)
{
state.setNull(false);
state.setDouble(state.getDouble() + value);
}
@CombineFunction
public static void combine(@AggregationState NullableDoubleState state, @AggregationState NullableDoubleState otherState)
{
if (state.isNull()) {
state.setNull(false);
state.setDouble(otherState.getDouble());
return;
}
state.setDouble(state.getDouble() + otherState.getDouble());
}
@OutputFunction(StandardTypes.DOUBLE)
public static void output(@AggregationState NullableDoubleState state, BlockBuilder out)
{
NullableDoubleState.write(DoubleType.DOUBLE, state, out);
}
}