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class SimpleSparkHandler extends AbstractSparkHttpServiceHandler {

   @Path("/query")
  @GET
  def query(request: HttpServiceRequest, responder: HttpServiceResponder) {
    val sqlContext = SQLContext.getOrCreate(getSparkContext)
    val df = sqlContext.sql(Charsets.UTF_8.decode(request.getContent).toString);
    
    val builder = new StringBuilder
    df.collect().foreach(row => {
      builder.append(...)
    })
    responder.sendString(builder.toString)
  }
}