Github user phegstrom commented on the issue:
https://github.com/apache/spark/pull/22227
hey @HyukjinKwon , the SparkR test now failing is
```
Duplicated \argument entries in documentation object
'column_string_functions':
'pattern'
Functions with \usage entries need to have the appropriate \alias
entries, and all their arguments documented.
The \usage entries must correspond to syntactically valid R code.
See the chapter 'Writing R documentation files' in the 'Writing R
```
Can I not have `@param pattern` twice in the docs for the rdname
`column_string_functions`?
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