Github user marmbrus commented on a diff in the pull request: https://github.com/apache/spark/pull/11509#discussion_r55082136 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVRelation.scala --- @@ -246,8 +116,10 @@ object CSVRelation extends Logging { private[sql] class CSVOutputWriterFactory(params: CSVOptions) extends OutputWriterFactory { override def newInstance( path: String, + bucketId: Option[Int], dataSchema: StructType, context: TaskAttemptContext): OutputWriter = { + if (bucketId.isDefined) sys.error("csv doesn't support bucketing") --- End diff -- It should, but today it is still the responsibility of the `OutputWriter` to generate the filename and only some of the implementations can handle appending the bucket id. This should be done as part of [SPARK-13683](https://issues.apache.org/jira/browse/SPARK-13683).
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