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## 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 support `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). Author: Dongjoon Hyun <dongjoon@apache.org> Closes #12509 from dongjoon-hyun/SPARK-14639. |
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