spark CatalogExtension 源码
spark CatalogExtension 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/CatalogExtension.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.util.CaseInsensitiveStringMap;
/**
* An API to extend the Spark built-in session catalog. Implementation can get the built-in session
* catalog from {@link #setDelegateCatalog(CatalogPlugin)}, implement catalog functions with
* some custom logic and call the built-in session catalog at the end. For example, they can
* implement {@code createTable}, do something else before calling {@code createTable} of the
* built-in session catalog.
*
* @since 3.0.0
*/
@Evolving
public interface CatalogExtension extends TableCatalog, FunctionCatalog, SupportsNamespaces {
/**
* This will be called only once by Spark to pass in the Spark built-in session catalog, after
* {@link #initialize(String, CaseInsensitiveStringMap)} is called.
*/
void setDelegateCatalog(CatalogPlugin delegate);
}
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