Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/17429#discussion_r108047754
--- Diff: R/pkg/R/functions.R ---
@@ -3548,7 +3548,7 @@ setMethod("row_number",
#' array_contains
#'
-#' Returns true if the array contain the value.
+#' Returns null if the array is null, true if the array contains the
value, and false otherwise.
--- End diff --
Yea, I agree with being careful. For this PR, I followed the others. I
skimmed again and it seems we have not used the notation for `None`, `True` and
`False` in `functions.py`, and `NA, `TRUE` and `FALSE` in both `functions.R`.
I can grep and replace.
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