[GitHub] spark pull request #16579: [SPARK-19218][SQL] Fix SET command to show a resu...

[dongjoon-hyun <gi...@git.apache.org>]

Github user dongjoon-hyun commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16579#discussion_r97209831
  
    --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/command/SetCommand.scala ---
    @@ -79,16 +79,17 @@ case class SetCommand(kv: Option[(String, Option[String])]) extends RunnableComm
         // Queries all key-value pairs that are set in the SQLConf of the sparkSession.
         case None =>
           val runFunc = (sparkSession: SparkSession) => {
    -        sparkSession.conf.getAll.map { case (k, v) => Row(k, v) }.toSeq
    +        sparkSession.conf.getAll.toSeq.sorted.map { case (k, v) => Row(k, v) }
           }
           (keyValueOutput, runFunc)
     
         // Queries all properties along with their default values and docs that are defined in the
         // SQLConf of the sparkSession.
         case Some(("-v", None)) =>
           val runFunc = (sparkSession: SparkSession) => {
    -        sparkSession.sessionState.conf.getAllDefinedConfs.map { case (key, defaultValue, doc) =>
    -          Row(key, defaultValue, doc)
    +        sparkSession.sessionState.conf.getAllDefinedConfs.sorted.map {
    +          case (key, defaultValue, doc) =>
    +            Row(key, if (defaultValue == null) "null" else defaultValue, doc)
    --- End diff --
    
    This is the root cause to raise exceptions during decoding.


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