Github user mridulm commented on a diff in the pull request: https://github.com/apache/spark/pull/16204#discussion_r91838301 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileFormatWriter.scala --- @@ -311,7 +335,10 @@ object FileFormatWriter extends Logging { } else { "" } - val ext = bucketId + description.outputWriterFactory.getFileExtension(taskAttemptContext) + + // This must be in a form that matches our bucketing format. See BucketingUtils. + val ext = f"$bucketId.c$fileCounter%03d" + + description.outputWriterFactory.getFileExtension(taskAttemptContext) --- End diff -- Is there an assumption here on number of files per output partition ?
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