spark PartitionReaderWithPartitionValues 源码
spark PartitionReaderWithPartitionValues 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/PartitionReaderWithPartitionValues.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.catalyst.InternalRow
import org.apache.spark.sql.catalyst.expressions.JoinedRow
import org.apache.spark.sql.catalyst.expressions.codegen.GenerateUnsafeProjection
import org.apache.spark.sql.connector.read.PartitionReader
import org.apache.spark.sql.types.StructType
/**
* A wrapper reader that always appends partition values to [[InternalRow]]s produced by the input
* reader [[fileReader]].
*/
class PartitionReaderWithPartitionValues(
fileReader: PartitionReader[InternalRow],
readDataSchema: StructType,
partitionSchema: StructType,
partitionValues: InternalRow) extends PartitionReader[InternalRow] {
private val fullSchema = readDataSchema.toAttributes ++ partitionSchema.toAttributes
private val unsafeProjection = GenerateUnsafeProjection.generate(fullSchema, fullSchema)
// Note that we have to apply the converter even though `file.partitionValues` is empty.
// This is because the converter is also responsible for converting safe `InternalRow`s into
// `UnsafeRow`s
private val rowConverter = {
if (partitionSchema.isEmpty) {
() => unsafeProjection(fileReader.get())}
else {
val joinedRow = new JoinedRow()
() => unsafeProjection(joinedRow(fileReader.get(), partitionValues))
}
}
override def next(): Boolean = fileReader.next()
override def get(): InternalRow = rowConverter()
override def close(): Unit = fileReader.close()
}
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