GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/12509
[WIP][SPARK-14639] Add `bround` function in Python/R.
## What changes were proposed in this pull request?
This issue aims to expose Scala `bround` function in Python/R API.
`bround` function is implemented in SPARK-14614 by extending current
`round` function.
We used the following semantics from Hive.
```java
public static double bround(double input, int scale) {
if (Double.isNaN(input) || Double.isInfinite(input)) {
return input;
}
return BigDecimal.valueOf(input).setScale(scale,
RoundingMode.HALF_EVEN).doubleValue();
}
```
After this PR, `pyspark` and `sparkR` also can use `bround` function.
**PySpark**
```python
>>> from pyspark.sql.functions import bround
>>> sqlContext.createDataFrame([(2.5,)], ['a']).select(bround('a',
0).alias('r')).collect()
[Row(r=2.0)]
```
**SparkR**
```r
> df = createDataFrame(sqlContext, data.frame(x=c(2.5,3.5)))
> head(collect(select(df, bround(df$x,0))))
bround(x, 0)
1 2
2 4
```
## How was this patch tested?
Pass the Jenkins tests (including new testcases).
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-14639
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12509.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 #12509
----
commit e63e1faea44bb459711008568d917e94b89a9610
Author: Dongjoon Hyun <[email protected]>
Date: 2016-04-19T22:46:06Z
[SPARK-14639] Add bround function in Python/R.
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