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[SPARK-9856] [SPARKR] Add expression functions into SparkR whose params are complicated
I added lots of Column functinos into SparkR. And I also added `rand(seed: Int)` and `randn(seed: Int)` in Scala. Since we need such APIs for R integer type. ### JIRA [[SPARK-9856] Add expression functions into SparkR whose params are complicated - ASF JIRA](https://issues.apache.org/jira/browse/SPARK-9856) Author: Yu ISHIKAWA <yuu.ishikawa@gmail.com> Closes #8264 from yu-iskw/SPARK-9856-3.
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- R/pkg/NAMESPACE 28 additions, 0 deletionsR/pkg/NAMESPACE
- R/pkg/R/functions.R 415 additions, 0 deletionsR/pkg/R/functions.R
- R/pkg/R/generics.R 113 additions, 0 deletionsR/pkg/R/generics.R
- R/pkg/inst/tests/test_sparkSQL.R 92 additions, 6 deletionsR/pkg/inst/tests/test_sparkSQL.R
- core/src/main/scala/org/apache/spark/api/r/RBackendHandler.scala 1 addition, 0 deletions...c/main/scala/org/apache/spark/api/r/RBackendHandler.scala
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