Github user huaxingao commented on a diff in the pull request:
https://github.com/apache/spark/pull/21835#discussion_r205538890
--- Diff: R/pkg/R/functions.R ---
@@ -3320,7 +3321,7 @@ setMethod("explode",
#' @aliases sequence sequence,Column-method
#' @note sequence since 2.4.0
setMethod("sequence",
- signature(x = "Column", y = "Column"),
+ signature(),
--- End diff --
@felixcheung
It seems that if I only have ... in the generic function,
```
setGeneric("sequence", function(...) { standardGeneric("sequence") })
```
I can't have anything is the signature. Otherwise I will have Error in
matchSignature.
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