spark FunctionCatalog 源码
spark FunctionCatalog 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/FunctionCatalog.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.catalyst.analysis.NoSuchFunctionException;
import org.apache.spark.sql.catalyst.analysis.NoSuchNamespaceException;
import org.apache.spark.sql.connector.catalog.functions.UnboundFunction;
/**
* Catalog methods for working with Functions.
*
* @since 3.2.0
*/
@Evolving
public interface FunctionCatalog extends CatalogPlugin {
/**
* List the functions in a namespace from the catalog.
* <p>
* If there are no functions in the namespace, implementations should return an empty array.
*
* @param namespace a multi-part namespace
* @return an array of Identifiers for functions
* @throws NoSuchNamespaceException If the namespace does not exist (optional).
*/
Identifier[] listFunctions(String[] namespace) throws NoSuchNamespaceException;
/**
* Load a function by {@link Identifier identifier} from the catalog.
*
* @param ident a function identifier
* @return an unbound function instance
* @throws NoSuchFunctionException If the function doesn't exist
*/
UnboundFunction loadFunction(Identifier ident) throws NoSuchFunctionException;
/**
* Returns true if the function exists, false otherwise.
*
* @since 3.3.0
*/
default boolean functionExists(Identifier ident) {
try {
loadFunction(ident);
return true;
} catch (NoSuchFunctionException e) {
return false;
}
}
}
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