Github user felixcheung commented on the pull request:
https://github.com/apache/spark/pull/10171#issuecomment-162639856
@shivaram `conflicts` would return any object that is masked, so that could
involve local objects/variables. You can see the example with `lm`
[here](https://stat.ethz.ch/R-manual/R-devel/library/base/html/conflicts.html).
I have verified this via SPARK_HOME/R/run_tests.sh - with this load order:
```
base ... -> stats ... -> testthat -> SparkR
```
I guess it is possible that something in profile or loading with an
explicit `library(... pos = "package:base")` that changes it, but since
`testthat` [suggest](http://r-pkgs.had.co.nz/check.html#check) running test
from `R CMD check` I think we should have full control over what packages are
loaded.
For now I assume we want to detect conflicts with `base` and `stats` only,
but we could certain add `dplyr` or `S4Vectors` to the list (though we would
have a lot more conflicts then, as discovered from that earlier investigation)
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