io.trino.operator.aggregation.arrayagg.ArrayAggregationStateSerializer 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.arrayagg;
import io.trino.spi.block.ArrayBlockBuilder;
import io.trino.spi.block.Block;
import io.trino.spi.block.BlockBuilder;
import io.trino.spi.function.AccumulatorStateSerializer;
import io.trino.spi.function.TypeParameter;
import io.trino.spi.type.ArrayType;
import io.trino.spi.type.Type;
public class ArrayAggregationStateSerializer
implements AccumulatorStateSerializer
{
private final Type arrayType;
public ArrayAggregationStateSerializer(@TypeParameter("T") Type elementType)
{
this.arrayType = new ArrayType(elementType);
}
@Override
public Type getSerializedType()
{
return arrayType;
}
@Override
public void serialize(ArrayAggregationState state, BlockBuilder out)
{
if (state.isEmpty()) {
out.appendNull();
}
else {
((ArrayBlockBuilder) out).buildEntry(state::writeAll);
}
}
@Override
public void deserialize(Block block, int index, ArrayAggregationState state)
{
((SingleArrayAggregationState) state).setTempDeserializeBlock((Block) arrayType.getObject(block, index));
}
}