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Oscar D. Lara Yejas 0c99c23b7d [SPARK-13734][SPARKR] Added histogram function 
## What changes were proposed in this pull request?

Added method histogram() to compute the histogram of a Column

Usage:

```
## Create a DataFrame from the Iris dataset
irisDF <- createDataFrame(sqlContext, iris)

## Render a histogram for the Sepal_Length column
histogram(irisDF, "Sepal_Length", nbins=12)

```
![histogram](https://cloud.githubusercontent.com/assets/13985649/13588486/e1e751c6-e484-11e5-85db-2fc2115c4bb2.png)

Note: Usage will change once SPARK-9325 is figured out so that histogram() only takes a Column as a parameter, as opposed to a DataFrame and a name

## How was this patch tested?

All unit tests pass. I added specific unit cases for different scenarios.

Author: Oscar D. Lara Yejas <odlaraye@oscars-mbp.usca.ibm.com>
Author: Oscar D. Lara Yejas <odlaraye@oscars-mbp.attlocal.net>

Closes #11569 from olarayej/SPARK-13734.
2016-04-26 15:34:30 -07:00
..
profile [SPARK-13812][SPARKR] Fix SparkR lint-r test errors. 2016-03-13 14:30:44 -07:00
test_support [SPARK-8607] SparkR -- jars not being added to application classpath correctly 2015-06-26 17:06:16 -07:00
tests/testthat [SPARK-13734][SPARKR] Added histogram function 2016-04-26 15:34:30 -07:00
worker [SPARK-13812][SPARKR] Fix SparkR lint-r test errors. 2016-03-13 14:30:44 -07:00