Github user uncleGen commented on a diff in the pull request: https://github.com/apache/spark/pull/17395#discussion_r107637615 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileFormatWriter.scala --- @@ -292,7 +292,10 @@ object FileFormatWriter extends Logging { override def execute(iter: Iterator[InternalRow]): Set[String] = { var fileCounter = 0 var recordsInFile: Long = 0L - newOutputWriter(fileCounter) + // Skip the empty partition to avoid creating a mass of 'empty' files. + if (iter.hasNext) { + newOutputWriter(fileCounter) --- End diff -- Let me see how to cover this case
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