spark SupportsRead 源码
spark SupportsRead 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/SupportsRead.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.catalog;
import org.apache.spark.annotation.Evolving;
import org.apache.spark.sql.connector.read.Scan;
import org.apache.spark.sql.connector.read.ScanBuilder;
import org.apache.spark.sql.util.CaseInsensitiveStringMap;
/**
* A mix-in interface of {@link Table}, to indicate that it's readable. This adds
* {@link #newScanBuilder(CaseInsensitiveStringMap)} that is used to create a scan for batch,
* micro-batch, or continuous processing.
*
* @since 3.0.0
*/
@Evolving
public interface SupportsRead extends Table {
/**
* Returns a {@link ScanBuilder} which can be used to build a {@link Scan}. Spark will call this
* method to configure each data source scan.
*
* @param options The options for reading, which is an immutable case-insensitive
* string-to-string map.
*/
ScanBuilder newScanBuilder(CaseInsensitiveStringMap options);
}
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