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

    https://github.com/apache/spark/pull/3672#discussion_r21718707
  
    --- Diff: 
sql/hive-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/HiveThriftServer2.scala
 ---
    @@ -85,10 +86,22 @@ private[hive] class HiveThriftServer2(hiveContext: 
HiveContext)
         setSuperField(this, "cliService", sparkSqlCliService)
         addService(sparkSqlCliService)
     
    -    val thriftCliService = new ThriftBinaryCLIService(sparkSqlCliService)
    -    setSuperField(this, "thriftCLIService", thriftCliService)
    -    addService(thriftCliService)
    +    if (isHTTPTransportMode(hiveConf)){
    +      val thriftCliService = new ThriftHttpCLIService(sparkSqlCliService)
    +      setSuperField(this, "thriftCLIService", thriftCliService)
    +      addService(thriftCliService)
    +    } else {
    +      val thriftCliService = new ThriftBinaryCLIService(sparkSqlCliService)
    +      setSuperField(this, "thriftCLIService", thriftCliService)
    +      addService(thriftCliService)
    +    }
     
         initCompositeService(hiveConf)
       }
    +
    +  private def isHTTPTransportMode(hiveConf: HiveConf): Boolean = {
    +    val transportMode: String = 
hiveConf.getVar(ConfVars.HIVE_SERVER2_TRANSPORT_MODE)
    +    return transportMode.equalsIgnoreCase("http")
    --- End diff --
    
    Didn't know return value is not required (thanks for pointing that out). 
Style-wise, is it a good idea to omit return though? Explicitly use the return 
value seems more clear for code readability. If this is the preferred way in 
scala, I will remove the return value. 



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