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Yu ISHIKAWA authored
### 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) Author: Yu ISHIKAWA <yuu.ishikawa@gmail.com> Closes #8194 from yu-iskw/SPARK-9856.
Yu ISHIKAWA authored### 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) Author: Yu ISHIKAWA <yuu.ishikawa@gmail.com> Closes #8194 from yu-iskw/SPARK-9856.
