Github user falaki commented on a diff in the pull request:
https://github.com/apache/spark/pull/19551#discussion_r146160421
--- Diff: R/pkg/R/DataFrame.R ---
@@ -1191,6 +1191,9 @@ setMethod("collect",
vec <- do.call(c, col)
stopifnot(class(vec) != "list")
class(vec) <- PRIMITIVE_TYPES[[colType]]
+ if (stringsAsFactors && is.character(vec)) {
--- End diff --
For performance maybe it is better to reverse the order of checks:
`is.character(vec) && stringsAsFactors`
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