spark RenameTableExec 源码
spark RenameTableExec 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/RenameTableExec.scala
/*
* 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.execution.datasources.v2
import org.apache.spark.sql.SparkSession
import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.catalyst.expressions.Attribute
import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
import org.apache.spark.sql.connector.catalog.{Identifier, TableCatalog}
import org.apache.spark.storage.StorageLevel
/**
* Physical plan node for renaming a table.
*/
case class RenameTableExec(
catalog: TableCatalog,
oldIdent: Identifier,
newIdent: Identifier,
invalidateCache: () => Option[StorageLevel],
cacheTable: (SparkSession, LogicalPlan, Option[String], StorageLevel) => Unit)
extends LeafV2CommandExec {
override def output: Seq[Attribute] = Seq.empty
override protected def run(): Seq[InternalRow] = {
import org.apache.spark.sql.connector.catalog.CatalogV2Implicits.IdentifierHelper
val optOldStorageLevel = invalidateCache()
catalog.invalidateTable(oldIdent)
// If new identifier consists of a table name only, the table should be renamed in place.
// Such behavior matches to the v1 implementation of table renaming in Spark and other DBMSs.
val qualifiedNewIdent = if (newIdent.namespace.isEmpty) {
Identifier.of(oldIdent.namespace, newIdent.name)
} else newIdent
catalog.renameTable(oldIdent, qualifiedNewIdent)
optOldStorageLevel.foreach { oldStorageLevel =>
val tbl = catalog.loadTable(qualifiedNewIdent)
val newRelation = DataSourceV2Relation.create(tbl, Some(catalog), Some(qualifiedNewIdent))
cacheTable(
session,
newRelation,
Some(qualifiedNewIdent.quoted), oldStorageLevel)
}
Seq.empty
}
}
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