spark ExternalCommandRunner 源码
spark ExternalCommandRunner 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/ExternalCommandRunner.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.connector;
import org.apache.spark.annotation.Unstable;
import org.apache.spark.sql.util.CaseInsensitiveStringMap;
/**
* An interface to execute an arbitrary string command inside an external execution engine rather
* than Spark. This could be useful when user wants to execute some commands out of Spark. For
* example, executing custom DDL/DML command for JDBC, creating index for ElasticSearch, creating
* cores for Solr and so on.
* <p>
* This interface will be instantiated when end users call `SparkSession#executeCommand`.
*
* @since 3.0.0
*/
@Unstable
public interface ExternalCommandRunner {
/**
* Execute the given command.
*
* @param command The command string provided by users.
* @param options The user-specified case-insensitive options.
*
* @return The output of the command.
*/
String[] executeCommand(String command, CaseInsensitiveStringMap options);
}
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