spark V1Scan 源码
spark V1Scan 代码
文件路径：/sql/core/src/main/java/org/apache/spark/sql/connector/read/V1Scan.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.read;
import org.apache.spark.annotation.Unstable;
import org.apache.spark.sql.SQLContext;
import org.apache.spark.sql.sources.BaseRelation;
import org.apache.spark.sql.sources.TableScan;
/**
* A trait that should be implemented by V1 DataSources that would like to leverage the DataSource
* V2 read code paths.
*
* This interface is designed to provide Spark DataSources time to migrate to DataSource V2 and
* will be removed in a future Spark release.
*
* @since 3.0.0
*/
@Unstable
public interface V1Scan extends Scan {
/**
* Create an `BaseRelation` with `TableScan` that can scan data from DataSource v1 to RDD[Row].
*
* @since 3.0.0
*/
<T extends BaseRelation & TableScan> T toV1TableScan(SQLContext context);
}
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