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.sql;
  
  import org.apache.calcite.sql.parser.SqlParserPos;
  
  import static java.util.Objects.requireNonNull;
  
  /** Base class for CREATE, DROP and other DDL statements. */
  public abstract class SqlDdl extends SqlCall {
    /** Use this operator only if you don't have a better one. */
    protected static final SqlOperator DDL_OPERATOR =
        new SqlSpecialOperator("DDL", SqlKind.OTHER_DDL);
  
    private final SqlOperator operator;
  
    /** Creates a SqlDdl. */
    protected SqlDdl(SqlOperator operator, SqlParserPos pos) {
      super(pos);
      this.operator = requireNonNull(operator, "operator");
    }
  
    @Override public SqlOperator getOperator() {
      return operator;
    }
  }
  