Github user OopsOutOfMemory commented on the pull request:
https://github.com/apache/spark/pull/3935#issuecomment-69056638
e.g.
```
import org.apache.spark.sql.SQLContext
val sqlContext = new SQLContext(sc)
import sqlContext._
val jsonDDL = s"""
|CREATE TEMPORARY TABLE jsonTable
|USING org.apache.spark.sql.json
|OPTIONS (
| path
'file:///Users/shengli/git_repos/spark/examples/src/main/resources/people.json'
|)""".stripMargin
sqlContext.sql(jsonDDL)
sqlContext.sql("describe jsonTable").collect()
sqlContext.sql("describe extended jsonTable").collect()
scala> sqlContext.sql("describe jsonTable").collect()
15/01/08 01:20:11 INFO sources.DDLParser: is extended ? -> false
res1: Array[org.apache.spark.sql.Row] = Array([#
col_name,data_type,comment], [age,IntegerType,null], [name,StringType,null])
scala>
scala> sqlContext.sql("describe extended jsonTable").collect()
15/01/08 01:20:14 INFO sources.DDLParser: is extended ? -> true
res2: Array[org.apache.spark.sql.Row] = Array([#
col_name,data_type,comment], [age,IntegerType,null], [name,StringType,null], [#
extended,null,null])
```
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