Github user yanboliang commented on the pull request:
https://github.com/apache/spark/pull/10829#issuecomment-173802481
@sun-rui Thanks for your comments. There is a ```cov``` implementation at
stats.R with different signature:
```R
setMethod("cov",
signature(x = "DataFrame", col1 = "character", col2 =
"character"),
function(x, col1, col2) {
statFunctions <- callJMethod(x@sdf, "stat")
callJMethod(statFunctions, "cov", col1, col2)
})
```
And this ```cov``` has masked ```stats::cov```, so we can not add
```cov``` as alias to "covar_samp".
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