Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/16138
this is the CRAN check error:
```
* checking for missing documentation entries ... WARNING
Undocumented S4 methods:
generic 'to_date' and siglist 'Column,missing'
generic 'to_timestamp' and siglist 'Column,missing'
All user-level objects in a package (including S4 classes and methods)
should have documentation entries.
See the chapter 'Writing R documentation files' in the 'Writing R
Extensions' manual.
* checking for code/documentation mismatches ... OK
* checking Rd \usage sections ... WARNING
Objects in \usage without \alias in documentation object 'to_date':
'\S4method{to_date}{Column,missing}'
Objects in \usage without \alias in documentation object 'to_timestamp':
'\S4method{to_timestamp}{Column,missing}'
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
```
you probably change it to `@alias to_date,Column,missing-method`
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