Github user anabranch commented on the issue:
https://github.com/apache/spark/pull/16138
@felixcheung Just tried that it doesn't seem to work.
Here's the strange thing, it should follow the *exact* same structure as
[unix_timestamp](https://github.com/apache/spark/blob/master/R/pkg/R/functions.R#L3015)
except that I don't have a signature that takes 0 parameters (i.e.,
[unix_timestamp
L3031](https://github.com/apache/spark/blob/master/R/pkg/R/functions.R#L3031).
Now if I copy and paste the `unix_timestamp` section and change the names,
it **will compile**. However as soon as I remove the first function (like
L3031, that takes no parameters). It will fail again with the same error.
I also tried removing everything and just creating one function at a time.
just this code will work.
```
#' to_date
#'
#' Converts the column into DateType, optionally with a format. Returns
null if input is invalid.
#' Specify formats according to:
http://docs.oracle.com/javase/tutorial/i18n/format/simpleDateFormat.html
#'
#' @param x Column to parse.
#' @param format string to use to parse x Column to DateType.
#'
#' @rdname to_date
#' @name to_date
#' @family datetime_funcs
#' @aliases to_date,Column-method
#' @export
#' @examples
#' \dontrun{
#' to_date(df$c, 'yyyy-MM-dd')
#' }
#' @note to_date(Column, format) since 2.2.0
setMethod("to_date",
signature(x = "Column"),
function(x) {
jc <- callJStatic("org.apache.spark.sql.functions", "to_date",
x@jc)
column(jc)
})
```
However if I add *any* other parameters to that method (or signature). It
will fail.
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