Github user olarayej commented on a diff in the pull request:
https://github.com/apache/spark/pull/11220#discussion_r53375517
--- Diff: R/pkg/R/DataFrame.R ---
@@ -303,8 +303,28 @@ setMethod("colnames",
#' @rdname columns
#' @name colnames<-
setMethod("colnames<-",
- signature(x = "DataFrame", value = "character"),
--- End diff --
The reason I added this was because of this:
> colnames(iris) <- 1
Error in `colnames<-`(`*tmp*`, value = 1) :
'dimnames' applied to non-array
After I ran that, I saw this:
> showMethods("colnames<-")
Function: colnames<- (package SparkR)
x="ANY", value="ANY"
x="DataFrame", value="character"
x="DataFrame", value="numeric"
(inherited from: x="ANY", value="ANY")
So looks like R automatically adds definitions of colnames<- if value is
other than character.
This does not happen with coltypes<-, as it's not part of base package and
doesn't have an (ANY,ANY) signature.
> coltypes(irisDF) <- 1
Error in (function (classes, fdef, mtable) :
unable to find an inherited method for function âcoltypes<-â for
signature â"DataFrame", "numeric"â
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