io.trino.operator.SimpleChannelComparator 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;
import io.trino.spi.TrinoException;
import io.trino.spi.block.Block;
import io.trino.type.BlockTypeOperators.BlockPositionComparison;
import static com.google.common.base.Throwables.throwIfUnchecked;
import static io.trino.operator.SyntheticAddress.decodePosition;
import static io.trino.operator.SyntheticAddress.decodeSliceIndex;
import static io.trino.spi.StandardErrorCode.GENERIC_INTERNAL_ERROR;
import static java.util.Objects.requireNonNull;
public class SimpleChannelComparator
implements PagesIndexComparator
{
private final int leftChannel;
private final int rightChannel;
private final BlockPositionComparison comparator;
public SimpleChannelComparator(int leftChannel, int rightChannel, BlockPositionComparison comparator)
{
this.leftChannel = leftChannel;
this.rightChannel = rightChannel;
this.comparator = requireNonNull(comparator, "comparator is null");
}
@Override
public int compareTo(PagesIndex pagesIndex, int leftPosition, int rightPosition)
{
long leftPageAddress = pagesIndex.getValueAddresses().getLong(leftPosition);
int leftBlockIndex = decodeSliceIndex(leftPageAddress);
int leftBlockPosition = decodePosition(leftPageAddress);
long rightPageAddress = pagesIndex.getValueAddresses().getLong(rightPosition);
int rightBlockIndex = decodeSliceIndex(rightPageAddress);
int rightBlockPosition = decodePosition(rightPageAddress);
try {
Block leftBlock = pagesIndex.getChannel(leftChannel).get(leftBlockIndex);
Block rightBlock = pagesIndex.getChannel(rightChannel).get(rightBlockIndex);
return (int) comparator.compare(leftBlock, leftBlockPosition, rightBlock, rightBlockPosition);
}
catch (Throwable throwable) {
throwIfUnchecked(throwable);
throw new TrinoException(GENERIC_INTERNAL_ERROR, throwable);
}
}
}