io.trino.operator.unnest.ReplicatedBlockBuilder 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.unnest;
import io.trino.spi.block.Block;
import io.trino.spi.block.DictionaryBlock;
import java.util.Arrays;
import static java.util.Objects.requireNonNull;
public class ReplicatedBlockBuilder
{
private Block source;
private int sourcePosition;
public void resetInputBlock(Block source)
{
this.source = requireNonNull(source, "source is null");
sourcePosition = 0;
}
public Block buildOutputBlock(int[] outputEntriesPerPosition, int offset, int inputBatchSize, int outputRowCount)
{
int[] ids = new int[outputRowCount];
int fromPosition = 0;
for (int i = 0; i < inputBatchSize; i++) {
int toPosition = fromPosition + outputEntriesPerPosition[offset + i];
Arrays.fill(ids, fromPosition, toPosition, sourcePosition++);
fromPosition = toPosition;
}
return DictionaryBlock.create(outputRowCount, source, ids);
}
}