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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