spark FilePartitionReaderFactory 源码
spark FilePartitionReaderFactory 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/FilePartitionReaderFactory.scala
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* 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.
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package org.apache.spark.sql.execution.datasources.v2
import org.apache.spark.sql.catalyst.{FileSourceOptions, InternalRow}
import org.apache.spark.sql.connector.read.{InputPartition, PartitionReader, PartitionReaderFactory}
import org.apache.spark.sql.errors.QueryExecutionErrors
import org.apache.spark.sql.execution.datasources.{FilePartition, PartitionedFile}
import org.apache.spark.sql.vectorized.ColumnarBatch
abstract class FilePartitionReaderFactory extends PartitionReaderFactory {
protected def options: FileSourceOptions
override def createReader(partition: InputPartition): PartitionReader[InternalRow] = {
assert(partition.isInstanceOf[FilePartition])
val filePartition = partition.asInstanceOf[FilePartition]
val iter = filePartition.files.iterator.map { file =>
PartitionedFileReader(file, buildReader(file))
}
new FilePartitionReader[InternalRow](iter, options)
}
override def createColumnarReader(partition: InputPartition): PartitionReader[ColumnarBatch] = {
assert(partition.isInstanceOf[FilePartition])
val filePartition = partition.asInstanceOf[FilePartition]
val iter = filePartition.files.iterator.map { file =>
PartitionedFileReader(file, buildColumnarReader(file))
}
new FilePartitionReader[ColumnarBatch](iter, options)
}
def buildReader(partitionedFile: PartitionedFile): PartitionReader[InternalRow]
def buildColumnarReader(partitionedFile: PartitionedFile): PartitionReader[ColumnarBatch] = {
throw QueryExecutionErrors.cannotCreateColumnarReaderError()
}
}
// A compound class for combining file and its corresponding reader.
private[v2] case class PartitionedFileReader[T](
file: PartitionedFile,
reader: PartitionReader[T]) extends PartitionReader[T] {
override def next(): Boolean = reader.next()
override def get(): T = reader.get()
override def close(): Unit = reader.close()
override def toString: String = file.toString
}
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