[GitHub] spark pull request #17989: [SPARK-6628][SQL][Branch-1.6] Fix ClassCastExcept...

[weiqingy <gi...@git.apache.org>]

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

    https://github.com/apache/spark/pull/17989#discussion_r116631706
  
    --- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/hiveWriterContainers.scala ---
    @@ -70,8 +70,11 @@ private[hive] class SparkHiveWriterContainer(
       @transient protected lazy val committer = conf.value.getOutputCommitter
       @transient protected lazy val jobContext = newJobContext(conf.value, jID.value)
       @transient private lazy val taskContext = newTaskAttemptContext(conf.value, taID.value)
    -  @transient private lazy val outputFormat =
    -    conf.value.getOutputFormat.asInstanceOf[HiveOutputFormat[AnyRef, Writable]]
    +  @transient private lazy val outputFormat = conf.value.getOutputFormat match {
    --- End diff --
    
    outputFormat is only used in `[Utilities.getFileExtension(conf.value, fileSinkConf.getCompressed, outputFormat)](https://github.com/weiqingy/spark/blob/0fa2bb791d1fa9c37fe89c1942ce0ed950a9ee59/sql/hive/src/main/scala/org/apache/spark/sql/hive/hiveWriterContainers.scala#L96)` to get the file extension. If `outputFormat` is "null", the extension will be "".


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