GitHub user linbojin opened a pull request:
https://github.com/apache/spark/pull/16276
[SPARK-18855][CORE] Add RDD flatten function
## What changes were proposed in this pull request?
Added a new flatten function for RDD.
## How was this patch tested?
Unit tests inside RDDSuite and manually tests:
```
scala> val rdd = sc.makeRDD(List(List(1, 2, 3), List(4, 5), List(6)))
rdd: org.apache.spark.rdd.RDD[List[Int]] = ParallelCollectionRDD[0] at
makeRDD at <console>:24
scala> rdd.flatten.collect
res0: Array[Int] = Array(1, 2, 3, 4, 5, 6)
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/linbojin/spark SPARK-18855-add-rdd-flatten
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16276.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #16276
----
commit 2c0903ac07367cf203e4b1ed6bf4ac1894976ec9
Author: linbojin <linbojin...@gmail.com>
Date: 2016-12-14T06:04:48Z
add RDD flatten function and tests
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