io.trino.sql.planner.HashBucketFunction 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.sql.planner;
import io.trino.operator.HashGenerator;
import io.trino.spi.Page;
import io.trino.spi.connector.BucketFunction;
import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.base.Preconditions.checkArgument;
public class HashBucketFunction
implements BucketFunction
{
private final HashGenerator generator;
private final int bucketCount;
public HashBucketFunction(HashGenerator generator, int bucketCount)
{
checkArgument(bucketCount > 0, "partitionCount must be at least 1");
this.generator = generator;
this.bucketCount = bucketCount;
}
@Override
public int getBucket(Page page, int position)
{
return generator.getPartition(bucketCount, position, page);
}
@Override
public String toString()
{
return toStringHelper(this)
.add("generator", generator)
.add("bucketCount", bucketCount)
.toString();
}
}