spark NamespaceChange 源码
spark NamespaceChange 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/NamespaceChange.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;
/**
* NamespaceChange subclasses represent requested changes to a namespace. These are passed to
* {@link SupportsNamespaces#alterNamespace}. For example,
* <pre>
* import NamespaceChange._
* val catalog = Catalogs.load(name)
* catalog.alterNamespace(ident,
* setProperty("prop", "value"),
* removeProperty("other_prop")
* )
* </pre>
*
* @since 3.0.0
*/
@Evolving
public interface NamespaceChange {
/**
* Create a NamespaceChange for setting a namespace property.
* <p>
* If the property already exists, it will be replaced with the new value.
*
* @param property the property name
* @param value the new property value
* @return a NamespaceChange for the addition
*/
static NamespaceChange setProperty(String property, String value) {
return new SetProperty(property, value);
}
/**
* Create a NamespaceChange for removing a namespace property.
* <p>
* If the property does not exist, the change will succeed.
*
* @param property the property name
* @return a NamespaceChange for the addition
*/
static NamespaceChange removeProperty(String property) {
return new RemoveProperty(property);
}
/**
* A NamespaceChange to set a namespace property.
* <p>
* If the property already exists, it must be replaced with the new value.
*/
final class SetProperty implements NamespaceChange {
private final String property;
private final String value;
private SetProperty(String property, String value) {
this.property = property;
this.value = value;
}
public String property() {
return property;
}
public String value() {
return value;
}
}
/**
* A NamespaceChange to remove a namespace property.
* <p>
* If the property does not exist, the change should succeed.
*/
final class RemoveProperty implements NamespaceChange {
private final String property;
private RemoveProperty(String property) {
this.property = property;
}
public String property() {
return property;
}
}
}
相关信息
相关文章
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
7、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦