spark TextWrite 源码
spark TextWrite 代码
文件路径:/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/text/TextWrite.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.text
import org.apache.hadoop.mapreduce.{Job, TaskAttemptContext}
import org.apache.spark.sql.catalyst.util.CompressionCodecs
import org.apache.spark.sql.connector.write.LogicalWriteInfo
import org.apache.spark.sql.errors.QueryCompilationErrors
import org.apache.spark.sql.execution.datasources.{CodecStreams, OutputWriter, OutputWriterFactory}
import org.apache.spark.sql.execution.datasources.text.{TextOptions, TextOutputWriter}
import org.apache.spark.sql.execution.datasources.v2.FileWrite
import org.apache.spark.sql.internal.SQLConf
import org.apache.spark.sql.types._
case class TextWrite(
paths: Seq[String],
formatName: String,
supportsDataType: DataType => Boolean,
info: LogicalWriteInfo) extends FileWrite {
private def verifySchema(schema: StructType): Unit = {
if (schema.size != 1) {
throw QueryCompilationErrors.textDataSourceWithMultiColumnsError(schema)
}
}
override def prepareWrite(
sqlConf: SQLConf,
job: Job,
options: Map[String, String],
dataSchema: StructType): OutputWriterFactory = {
verifySchema(dataSchema)
val textOptions = new TextOptions(options)
val conf = job.getConfiguration
textOptions.compressionCodec.foreach { codec =>
CompressionCodecs.setCodecConfiguration(conf, codec)
}
new OutputWriterFactory {
override def newInstance(
path: String,
dataSchema: StructType,
context: TaskAttemptContext): OutputWriter = {
new TextOutputWriter(path, dataSchema, textOptions.lineSeparatorInWrite, context)
}
override def getFileExtension(context: TaskAttemptContext): String = {
".txt" + CodecStreams.getCompressionExtension(context)
}
}
}
}
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