spark broadcastMode 源码
spark broadcastMode 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/physical/broadcastMode.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.catalyst.plans.physical
import org.apache.spark.sql.catalyst.InternalRow
/**
* Marker trait to identify the shape in which tuples are broadcasted. Typical examples of this are
* identity (tuples remain unchanged) or hashed (tuples are converted into some hash index).
*/
trait BroadcastMode {
def transform(rows: Array[InternalRow]): Any
def transform(rows: Iterator[InternalRow], sizeHint: Option[Long]): Any
def canonicalized: BroadcastMode
}
/**
* IdentityBroadcastMode requires that rows are broadcasted in their original form.
*/
case object IdentityBroadcastMode extends BroadcastMode {
// TODO: pack the UnsafeRows into single bytes array.
override def transform(rows: Array[InternalRow]): Array[InternalRow] = rows
override def transform(
rows: Iterator[InternalRow],
sizeHint: Option[Long]): Array[InternalRow] = rows.toArray
override def canonicalized: BroadcastMode = this
}
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