[HADP-53427] AppId is missing when Show extended session (apache#349)

Author: colinmjj

sql/core/src/main/scala/org/apache/spark/sql/execution/command/session.scala

@@ -43,8 +43,9 @@ case class ShowSessionCommand(extended: Boolean = false)
   override def run(sparkSession: SparkSession): Seq[Row] = {
     val sessionId = sparkSession.sparkContext.getLocalProperty(SparkHadoopUtil.HIVE_SESSION_ID)
     if (extended) {
-      val application = sparkSession.sqlContext.conf.getConfString("spark.yarn.app.id", "");
-      val queue = sparkSession.sqlContext.conf.getConfString("spark.yarn.queue", "");
+      val application = System.getProperty("spark.yarn.app.id",
+        sparkSession.sqlContext.conf.getConfString("spark.yarn.app.id", ""))
+      val queue = sparkSession.sqlContext.conf.getConfString("spark.yarn.queue", "")
       val user = sparkSession.sessionState.catalog.getCurrentUser
       Row("session", sessionId, "session id") ::
         Row("app", application, "application id") ::