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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you 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 org.apache.calcite.rel;
import org.apache.calcite.util.mapping.IntPair;
import java.util.List;
/**
* Interface for a referential constraint, i.e., Foreign-Key - Unique-Key relationship,
* between two tables.
*/
public interface RelReferentialConstraint {
//~ Methods ----------------------------------------------------------------
/**
* Returns the number of columns in the keys.
*/
int getNumColumns();
/**The qualified name of the referencing table, e.g. DEPT. */
List getSourceQualifiedName();
/** The qualified name of the referenced table, e.g. EMP. */
List getTargetQualifiedName();
/** The (source, target) column ordinals. */
List getColumnPairs();
}
// End RelReferentialConstraint.java
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