content: /*
   * 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;
  
  import org.apache.calcite.rel.type.RelDataTypeFactory;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.List;
  
  /**
   * A <code>RelOptSchema</code> is a set of {@link RelOptTable} objects.
   */
  public interface RelOptSchema {
    //~ Methods ----------------------------------------------------------------
  
    /**
     * Retrieves a {@link RelOptTable} based upon a member access.
     *
     * <p>For example, the Saffron expression <code>salesSchema.emps</code>
     * would be resolved using a call to <code>salesSchema.getTableForMember(new
     * String[]{"emps" })</code>.
     *
     * <p>Note that name.length is only greater than 1 for queries originating
     * from JDBC.
     *
     * @param names Qualified name
     */
    @Nullable RelOptTable getTableForMember(List<String> names);
  
    /**
     * Returns the {@link RelDataTypeFactory type factory} used to generate
     * types for this schema.
     */
    RelDataTypeFactory getTypeFactory();
  
    /**
     * Registers all the rules supported by this schema. Only called by
     * {@link RelOptPlanner#registerSchema}.
     */
    void registerRules(RelOptPlanner planner);
  }
  