Github user sun-rui commented on a diff in the pull request:
https://github.com/apache/spark/pull/9680#discussion_r45166927
--- Diff: R/pkg/R/functions.R ---
@@ -259,6 +259,21 @@ setMethod("column",
function(x) {
col(x)
})
+#' corr
+#'
+#' Computes the Pearson Correlation Coefficient for two Columns.
+#'
+#' @rdname corr
+#' @name corr
+#' @family math_funcs
+#' @export
+#' @examples \dontrun{corr(df$c, df$d)}
+setMethod("corr", signature(x = "Column"),
--- End diff --
There are two versions of corr():
```
def corr(column1: Column, column2: Column): Column
def corr(columnName1: String, columnName2: String): Column
```
We'd better support both. Something like:
```
setMethod("corr", signature(x = "characterOrColumn"),
```
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