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.linq4j;
  
  /**
   * Abstract implementation of the {@link Queryable} interface that implements
   * the extension methods.
   *
   * <p>It is helpful to derive from this class if you are implementing
   * {@code Queryable}, because {@code Queryable} has so many extension methods,
   * but it is not required.
   *
   * @param <T> Element type
   */
  public abstract class AbstractQueryable<T> extends DefaultQueryable<T>
      implements Queryable<T> {
  }
  