Github user olarayej commented on the issue:
https://github.com/apache/spark/pull/11336
@falaki @felixcheung I have addressed all your comments. I'm getting two
documentation warnings which seem to be making the build fail:
1)
```
Undocumented S4 methods:
generic 'head' and siglist 'Column'
generic 'show' and siglist 'Column'
```
The documentation for these is on Data.Frame.R. I don't see a need for
duplicating the docs in column.R
2)
```
Undocumented arguments in documentation object 'Column-class'
'df'
Undocumented arguments in documentation object 'head'
'...'
```
I do have documentation for slot df in class Column. And also, I don't have
... as part of the signature of method head. Not sure why this warning comes up.
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