GitHub user wojtek-szymanski opened a pull request:
https://github.com/apache/spark/pull/17075
[SPARK-19727][SQL] Fix for round function that modifies original column
## What changes were proposed in this pull request?
Fix for SQL round function that modifies original column when underlying
data frame is created from a local product.
import org.apache.spark.sql.functions._
case class NumericRow(value: BigDecimal)
val df =
spark.createDataFrame(Seq(NumericRow(BigDecimal("1.23456789"))))
df.show()
+--------------------+
| value|
+--------------------+
|1.234567890000000000|
+--------------------+
df.withColumn("value_rounded", round('value)).show()
+--------------------+-------------+
| value|value_rounded|
+--------------------+-------------+
|1.000000000000000000| 1|
+--------------------+-------------+
## How was this patch tested?
New unit test added to existing suite
`org.apache.spark.sql.MathFunctionsSuite`
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wojtek-szymanski/spark SPARK-19727
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17075.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 #17075
----
commit ea7c2d3d1b8d71bacc905d01ca327f465ca61c86
Author: Wojtek Szymanski <[email protected]>
Date: 2017-02-27T01:42:37Z
Fix for SQL round function modifying original column
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