SumDataSizeForStats.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;
import com.facebook.presto.common.block.Block;
import com.facebook.presto.common.block.BlockBuilder;
import com.facebook.presto.common.type.BigintType;
import com.facebook.presto.common.type.StandardTypes;
import com.facebook.presto.operator.aggregation.state.NullableLongState;
import com.facebook.presto.spi.function.AggregationFunction;
import com.facebook.presto.spi.function.AggregationState;
import com.facebook.presto.spi.function.BlockIndex;
import com.facebook.presto.spi.function.BlockPosition;
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.function.TypeParameter;
import static com.facebook.presto.spi.function.SqlFunctionVisibility.HIDDEN;
@AggregationFunction(value = SumDataSizeForStats.NAME, visibility = HIDDEN)
public final class SumDataSizeForStats
{
public static final String NAME = "sum_data_size_for_stats";
private SumDataSizeForStats() {}
@InputFunction
@TypeParameter(value = "T")
public static void input(@AggregationState NullableLongState state, @BlockPosition @SqlType("T") Block block, @BlockIndex int index)
{
update(state, block.getEstimatedDataSizeForStats(index));
}
@CombineFunction
public static void combine(@AggregationState NullableLongState state, @AggregationState NullableLongState otherState)
{
update(state, otherState.getLong());
}
private static void update(NullableLongState state, long size)
{
if (state.isNull()) {
state.setNull(false);
state.setLong(size);
}
else {
state.setLong(state.getLong() + size);
}
}
@OutputFunction(StandardTypes.BIGINT)
public static void output(@AggregationState NullableLongState state, BlockBuilder out)
{
NullableLongState.write(BigintType.BIGINT, state, out);
}
}