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From anu <anamika.guo...@gmail.com>
Subject Transform a Schema RDD to another Schema RDD with a different schema
Date Wed, 18 Mar 2015 05:50:33 GMT
I have a schema RDD with thw following Schema :

scala> mainRDD.printSchema
root
 |-- COL1: integer (nullable = false)
 |-- COL2: integer (nullable = false)
 |-- COL3: string (nullable = true)
 |-- COL4: double (nullable = false)
 |-- COL5: string (nullable = true)



Now, I transform the mainRDD like this :


scala> val sdf1 = new SimpleDateFormat("yyyy-mm-dd hh:mm:ss.SSS"); val
calendar = Calendar.getInstance()
 
scala> val mappedRDD : SchemaRDD = intf_ddRDD.map{ r => 
	| val end_time = sdf1.parse(r(2).toString); 
	| calendar.setTime(end_time); 
	| val r2 = new java.sql.Timestamp(end_time.getTime); 
	| val hour: Long = calendar.get(Calendar.HOUR_OF_DAY); 
	| (r(0).toString.toInt, r(1).toString.toInt, r2, hour,
r(3).toString.toDouble, r(4).toString)
	| }


scala>mappedRDD.printSchema
root
 |-- _1: integer (nullable = false)
 |-- _2: integer (nullable = false)
 |-- _3: timestamp (nullable = true)
 |-- _4: long (nullable = false)
 |-- _5: double (nullable = false)
 |-- _6: string (nullable = true)


But the issue is, despite specifying the mainRDD as SchemaRDD, it becomes
just an RDD (notice that the column names are lost in mappedRDD)

So, how can I do the above transformation on one SchemaRDD (mainRDD) to get
another SchemaRDD (mappedRDD) with a different Schema.

Please help me out.





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