title: where is the declaration of SchemaRDD in spark 1.3.0's API
body: <ol>
  <li><p>these code reports error in IDEA，why?</p>
  
  <pre><code>val sqlContext = new org.apache.spark.sql.SQLContext(sc)
  import sqlContext.createSchemaRDD
  val people = sc.textFile("c3/test.txt").map(_.split(",")).map(p =&gt; Person(p(0), p(1).trim.toInt))
  people.registerTempTable("people")
  </code></pre></li>
  <li><p>Is there another way to transform  <code>sqlContext</code> into <code>SchemaRDD</code>, excepting the <code>import sqlContext.createSchemaRDD</code>?</p></li>
  <li><p>I can't find the <code>SchemaRDD</code> class in spark api document, why? </p></li>
  </ol>