spark CsvOutputWriter 源码
spark CsvOutputWriter 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CsvOutputWriter.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.csv
import java.nio.charset.Charset
import org.apache.hadoop.fs.Path
import org.apache.hadoop.mapreduce.TaskAttemptContext
import org.apache.spark.internal.Logging
import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.catalyst.csv.{CSVOptions, UnivocityGenerator}
import org.apache.spark.sql.execution.datasources.{CodecStreams, OutputWriter}
import org.apache.spark.sql.types.StructType
class CsvOutputWriter(
val path: String,
dataSchema: StructType,
context: TaskAttemptContext,
params: CSVOptions) extends OutputWriter with Logging {
private val charset = Charset.forName(params.charset)
private val writer = CodecStreams.createOutputStreamWriter(context, new Path(path), charset)
private val gen = new UnivocityGenerator(dataSchema, writer, params)
if (params.headerFlag) {
gen.writeHeaders()
}
override def write(row: InternalRow): Unit = gen.write(row)
override def close(): Unit = gen.close()
}
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