Memory leak occurs when register temp table with cache table on

    val sparkConf = new SparkConf().setAppName("LeakTest")
    val sparkContext = new SparkContext(sparkConf)
    val sqlContext = new SQLContext(sparkContext)
    val tableName = "tmp"
    val jsonrdd = sparkContext.textFile("""sample.json""")
    var loopCount = 1L
    while(true) {
      sqlContext.jsonRDD(jsonrdd).registerTempTable(tableName)
      sqlContext.cacheTable(tableName)
      println("L: " +loopCount + " R:" + sqlContext.sql("""select count(*) from tmp""").count())
      sqlContext.uncacheTable(tableName)
      loopCount += 1
    }