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.asterix.lang.common.base;
  
  public interface Clause extends ILangExpression {
      public ClauseType getClauseType();
  
      public enum ClauseType {
          FOR_CLAUSE,
          LET_CLAUSE,
          WHERE_CLAUSE,
          GROUP_BY_CLAUSE,
          DISTINCT_BY_CLAUSE,
          ORDER_BY_CLAUSE,
          LIMIT_CLAUSE,
          UPDATE_CLAUSE,
  
          // SQL related clause
          FROM_CLAUSE,
          FROM_TERM,
          HAVING_CLAUSE,
          JOIN_CLAUSE,
          NEST_CLAUSE,
          PROJECTION,
          SELECT_BLOCK,
          SELECT_CLAUSE,
          SELECT_ELEMENT,
          SELECT_REGULAR,
          SELECT_SET_OPERATION,
          UNNEST_CLAUSE,
  
          EXTENSION
      }
  
  }
  