io.trino.operator.PrecomputedHashGenerator 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.Page;
import io.trino.spi.block.Block;
import static com.google.common.base.MoreObjects.toStringHelper;
import static io.trino.spi.type.BigintType.BIGINT;
public class PrecomputedHashGenerator
implements HashGenerator
{
private final int hashChannel;
public PrecomputedHashGenerator(int hashChannel)
{
this.hashChannel = hashChannel;
}
@Override
public long hashPosition(int position, Page page)
{
Block hashBlock = page.getBlock(hashChannel);
return BIGINT.getLong(hashBlock, position);
}
@Override
public String toString()
{
return toStringHelper(this)
.add("hashChannel", hashChannel)
.toString();
}
}