how to close the SQLContext programmatically?

Question

We have a Spark Streaming job, inside DStream foreachRDD method, i am creating a SQLContext, the reason that i am creating SQLContext inside foreachRDD method instead of outside is, when i enable check-pointing it says SQLContext is not serializable.

So i created inside foreachcRDD method, then its working fine.

But i want to close this SQLContext properly at the end of foreachRDD method. How can i do that?

Sample code:

dStream.foreachRDD(rdd =>
      {
        val sparkContext = rdd.sparkContext
        val sqlContext = new HiveContext(sc)

        //convert rdd to DF using sqlContext and process it
            ......
            ......
            ......
            ......

       //finally close the sqlContext
        sqlContext = null
        }
      })