Github user lw-lin commented on a diff in the pull request: https://github.com/apache/spark/pull/13575#discussion_r66467095 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetFileFormat.scala --- @@ -488,7 +488,12 @@ private[sql] class ParquetOutputWriterFactory( // Custom ParquetOutputFormat that disable use of committer and writes to the given path val outputFormat = new ParquetOutputFormat[InternalRow]() { override def getOutputCommitter(c: TaskAttemptContext): OutputCommitter = { null } - override def getDefaultWorkFile(c: TaskAttemptContext, ext: String): Path = { new Path(path) } + override def getDefaultWorkFile(c: TaskAttemptContext, ext: String): Path = { + // It has the `.parquet` extension at the end because (de)compression tools + // such as gunzip would not be able to decompress this as the compression + // is not applied on this whole file but on each "page" in Parquet format. + new Path(s"$path$ext") + } --- End diff -- This patch appends an extension to the assigned `path`; new `path` would be like `some_path.gz.parquet`.
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