io.trino.operator.RowReference 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;
/**
* Reference to a row.
*
* Note: RowReference gives us the ability to defer row ID generation (which can be expensive in tight loops).
*/
public interface RowReference
{
/**
* Compares the referenced row to the specified row ID using the provided RowIdComparisonStrategy.
*/
int compareTo(RowIdComparisonStrategy strategy, long rowId);
/**
* Checks equality of the referenced row with the specified row ID using the provided RowIdHashStrategy.
*/
boolean equals(RowIdHashStrategy strategy, long rowId);
/**
* Calculates the hash of the referenced row using the provided RowIdHashStrategy.
*/
long hash(RowIdHashStrategy strategy);
/**
* Allocate a stable row ID that can be used to reference this row at a future point.
*/
long allocateRowId();
}