f4bc01f1f3
I added lots of expression functions for SparkR. This PR includes only functions whose params are only `(Column)` or `(Column, Column)`. And I think we need to improve how to test those functions. However, it would be better to work on another issue. ## Diff Summary - Add lots of functions in `functions.R` and their generic in `generic.R` - Add aliases for `ceiling` and `sign` - Move expression functions from `column.R` to `functions.R` - Modify `rdname` from `column` to `functions` I haven't supported `not` function, because the name has a collesion with `testthat` package. I didn't think of the way to define it. ## New Supported Functions ``` approxCountDistinct ascii base64 bin bitwiseNOT ceil (alias: ceiling) crc32 dayofmonth dayofyear explode factorial hex hour initcap isNaN last_day length log2 ltrim md5 minute month negate quarter reverse round rtrim second sha1 signum (alias: sign) size soundex to_date trim unbase64 unhex weekofyear year datediff levenshtein months_between nanvl pmod ``` ## JIRA [[SPARK-9855] Add expression functions into SparkR whose params are simple - ASF JIRA](https://issues.apache.org/jira/browse/SPARK-9855) Author: Yu ISHIKAWA <yuu.ishikawa@gmail.com> Closes #8123 from yu-iskw/SPARK-9855. |
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