spark SaveMode 源码
spark SaveMode 代码
文件路径：/sql/core/src/main/java/org/apache/spark/sql/SaveMode.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.spark.sql;
import org.apache.spark.annotation.Stable;
/**
* SaveMode is used to specify the expected behavior of saving a DataFrame to a data source.
*
* @since 1.3.0
*/
@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
}
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