Github user uncleGen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/17395#discussion_r107821138
  
    --- 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 --
    
    Thanks for your prompt. How about just left one empty file containing the 
metadata when df has empty partition? Furthmore, we may just left one metadata 
file?


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