Github user zero323 commented on the issue:
https://github.com/apache/spark/pull/17783
In short, depending on how you set `@rdname` and `@name` we get warnings
```
`prepare_Rd: not.Rd: \name should not contain !`
```
or
```
Undocumented S4 methods:
generic '!' and siglist 'Column'
```
(not that we document any other `Column` operator) and both are considered
failures in our build. Attaching these to `Column` docs seems to do the trick,
but we put `column` function there as well, and it is not that clean.
I kind of know how to handle this by writing `Rd` files by hand, but it is
not a solution here.
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