core/src/main/java/org/apache/calcite/plan/RelOptConnection.java

/*
 * 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.plan;

/**
 * The planner's view of a connection to a database.
 *
 * <p>A connection contains a {@link RelOptSchema}, via which the query planner
 * can access {@link RelOptTable} objects.</p>
 */
public interface RelOptConnection {
  /**
   * Returns the schema underlying this connection.
   */
  RelOptSchema getRelOptSchema();
}