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.spark.sql;
  
  import org.apache.spark.annotation.InterfaceStability;
  
  /**
   * SaveMode is used to specify the expected behavior of saving a DataFrame to a data source.
   *
   * @since 1.3.0
   */
  @InterfaceStability.Stable
  public enum SaveMode {
    /**
     * Append mode means that when saving a DataFrame to a data source, if data/table already exists,
     * contents of the DataFrame are expected to be appended to existing data.
     *
     * @since 1.3.0
     */
    Append,
    /**
     * Overwrite mode means that when saving a DataFrame to a data source,
     * if data/table already exists, existing data is expected to be overwritten by the contents of
     * the DataFrame.
     *
     * @since 1.3.0
     */
    Overwrite,
    /**
     * ErrorIfExists mode means that when saving a DataFrame to a data source, if data already exists,
     * an exception is expected to be thrown.
     *
     * @since 1.3.0
     */
    ErrorIfExists,
    /**
     * Ignore mode means that when saving a DataFrame to a data source, if data already exists,
     * the save operation is expected to not save the contents of the DataFrame and to not
     * change the existing data.
     *
     * @since 1.3.0
     */
    Ignore
  }
  