exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/parser/SqlCreateType.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.drill.exec.planner.sql.parser;

/**
 * Enum which indicates type of CREATE statement.
 */
public enum SqlCreateType {

  /**
   * Attempts to execute CREATE command without checking if object to be created exists.
   * Will fail if object to be created exists.
   */
  SIMPLE,

  /**
   * Before CREATE command execution checks if object to be created exists.
   * If object to be created exists, will drop it and proceed execution.
   */
  OR_REPLACE,

  /**
   * Before CREATE command execution checks if object to be created exists.
   * If object to be created exists, does nothing.
   */
  IF_NOT_EXISTS
}