spark StagedTable 源码
spark StagedTable 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/StagedTable.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 java.util.Map;
import org.apache.spark.annotation.Evolving;
import org.apache.spark.sql.connector.expressions.Transform;
import org.apache.spark.sql.connector.write.LogicalWriteInfo;
import org.apache.spark.sql.types.StructType;
/**
* Represents a table which is staged for being committed to the metastore.
* <p>
* This is used to implement atomic CREATE TABLE AS SELECT and REPLACE TABLE AS SELECT queries. The
* planner will create one of these via
* {@link StagingTableCatalog#stageCreate(Identifier, StructType, Transform[], Map)} or
* {@link StagingTableCatalog#stageReplace(Identifier, StructType, Transform[], Map)} to prepare the
* table for being written to. This table should usually implement {@link SupportsWrite}. A new
* writer will be constructed via {@link SupportsWrite#newWriteBuilder(LogicalWriteInfo)}, and the
* write will be committed. The job concludes with a call to {@link #commitStagedChanges()}, at
* which point implementations are expected to commit the table's metadata into the metastore along
* with the data that was written by the writes from the write builder this table created.
*
* @since 3.0.0
*/
@Evolving
public interface StagedTable extends Table {
/**
* Finalize the creation or replacement of this table.
*/
void commitStagedChanges();
/**
* Abort the changes that were staged, both in metadata and from temporary outputs of this
* table's writers.
*/
void abortStagedChanges();
}
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