io.trino.operator.aggregation.state.HyperLogLogStateSerializer Maven / Gradle / Ivy
/*
* 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 io.trino.operator.aggregation.state;
import io.airlift.stats.cardinality.HyperLogLog;
import io.trino.spi.block.Block;
import io.trino.spi.block.BlockBuilder;
import io.trino.spi.function.AccumulatorStateSerializer;
import io.trino.spi.type.Type;
import static io.trino.spi.type.HyperLogLogType.HYPER_LOG_LOG;
public class HyperLogLogStateSerializer
implements AccumulatorStateSerializer
{
@Override
public Type getSerializedType()
{
return HYPER_LOG_LOG;
}
@Override
public void serialize(HyperLogLogState state, BlockBuilder out)
{
if (state.getHyperLogLog() == null) {
out.appendNull();
}
else {
HYPER_LOG_LOG.writeSlice(out, state.getHyperLogLog().serialize());
}
}
@Override
public void deserialize(Block block, int index, HyperLogLogState state)
{
state.setHyperLogLog(HyperLogLog.newInstance(HYPER_LOG_LOG.getSlice(block, index)));
}
}