GitHub user cryeo opened a pull request:
https://github.com/apache/spark/pull/22591
[SPARK-25571][SQL] Add withColumnsRenamed method to Dataset
## What changes were proposed in this pull request?
Add `withColumnsRenamed` method to rename multiple columns at a time as
follows.
```scala
// before
ds.withColumnRenamed("first_name", "firstName")
.withColumnRenamed("last_name", "lastName")
.withColumnRenamed("postal_code", "postalCode")
// after
ds.withColumnsRenamed(
"first_name" -> "firstName",
"last_name" -> "lastName",
"postal_code" -> "postalCode"
)
// or
ds.withColumnsRenamed(Map(
"first_name" -> "firstName",
"last_name" -> "lastName",
"postal_code" -> "postalCode"
))
```
## How was this patch tested?
This patch is tested by unit test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cryeo/spark SPARK-25571
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22591.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 #22591
----
commit af9dabe3919ae3811c258e5dbf224fb7bde225be
Author: Chaerim YEO <yeochaerim@...>
Date: 2018-09-29T13:57:16Z
[SPARK-25571][SQL] Add withColumnsRenamed method to Dataset
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