GitHub user yu-iskw opened a pull request:
https://github.com/apache/spark/pull/8194
[SPARK-9871][SparkR] Add expression functions into SparkR which have a
variable parameter
### Summary
- Add `lit` function
- Add `concat`, `greatest`, `least` functions
I think we need to improve `collect` function in order to implement
`struct` function. Since `collect` doesn't work with arguments which includes a
nested `list` variable. It seems that a list against `struct` still has `jobj`
classes. So it would be better to solve this problem on another issue.
### JIRA
[[SPARK-9871] Add expression functions into SparkR which have a variable
parameter - ASF JIRA](https://issues.apache.org/jira/browse/SPARK-9871)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/yu-iskw/spark SPARK-9856
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8194.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 #8194
----
commit 2a5f08446f7a39b8a0f32e9722f764501806d732
Author: Yu ISHIKAWA <[email protected]>
Date: 2015-08-13T06:08:27Z
[SPARK-9871][SparkR] Add expression functions into SparkR which have a
variable parameter
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