io.trino.operator.aggregation.minmaxn.MinMaxNStateSerializer 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.minmaxn;
import io.trino.operator.aggregation.minmaxn.MinMaxNStateFactory.SingleMinMaxNState;
import io.trino.spi.block.Block;
import io.trino.spi.block.BlockBuilder;
import io.trino.spi.block.SqlRow;
import io.trino.spi.function.AccumulatorStateSerializer;
import io.trino.spi.type.Type;
import static java.util.Objects.requireNonNull;
public abstract class MinMaxNStateSerializer
implements AccumulatorStateSerializer
{
private final Type serializedType;
public MinMaxNStateSerializer(Type serializedType)
{
this.serializedType = requireNonNull(serializedType, "serializedType is null");
}
@Override
public Type getSerializedType()
{
return serializedType;
}
@Override
public void serialize(T state, BlockBuilder out)
{
state.serialize(out);
}
@Override
public void deserialize(Block block, int index, T state)
{
// the aggregation framework uses a scratch single state for deserialization, and then calls the combine function
// for typed heap is is simpler to store the deserialized row block in the state and then add the row block
// directly to the heap in the combine
SqlRow sqlRow = (SqlRow) serializedType.getObject(block, index);
((SingleMinMaxNState) state).setTempSerializedState(sqlRow);
}
}