Github user zjffdu commented on a diff in the pull request:
https://github.com/apache/spark/pull/10290#discussion_r47583609
--- Diff: R/pkg/R/DataFrame.R ---
@@ -1903,7 +1903,7 @@ setMethod("except",
#' }
--- End diff --
@felixcheung Is it necessary to do that ? Because I notice there's no doc
for the default value in other R APIs. Actually user can see the default value
in the function signature which is also in the R doc.
```
## S4 method for signature 'DataFrame,character'
write.df(df, path, source = NULL,
mode = "error", ...)
```
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