Github user actuaryzhang commented on the issue:
https://github.com/apache/spark/pull/18025
@felixcheung Thanks for asking this. I should have been more clear.
`@name` is the "name" of the Rd object represented, which is unique. An Rd
object can have multiple aliases pointing to the same Rd. Usually, when one
specifies `@name xxx`, there will be a `@alias xxx` automatically created to
reference `xxx`.
In the `avg` case, I actually don't need `@name avg`, since the doc of
`avg` goes to `column_aggregate_functions`. In the new commit, I used `@aliases
avg avg,Column-method` which creates two aliases `avg` and `avg,Column-method`.
It now allows the following shortcut for help search which all direct to
the Rd object `column_aggregate_functions` (the `@name` object):
- `?avg`
- `?"avg,Column-method"`
- `help("avg")`
- `?column_aggregate_functions`
- Indeed, since this is S4 method, we can also do `method?avg("Column")`.
Details of R documentation here:
https://cran.r-project.org/doc/manuals/r-release/R-exts.html#Writing-R-documentation-files
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