[GitHub] [arrow] jorisvandenbossche commented on a change in pull request #12589: ARROW-14848 [R] Implement bindings for lubridate's parse_date_time, parse_date_time2, and fast_strptime

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jorisvandenbossche commented on a change in pull request #12589:
URL: https://github.com/apache/arrow/pull/12589#discussion_r822740289



##########
File path: r/R/dplyr-funcs-datetime.R
##########
@@ -167,4 +167,33 @@ register_bindings_datetime <- function() {
   register_binding("date", function(x) {
     build_expr("cast", x, options = list(to_type = date32()))
   })
+  register_binding("fast_strptime", function(x,
+                                             format,
+                                             tz = "UTC",
+                                             lt = TRUE,
+                                             cutoff_2000 = 68L,
+                                             unit = "s") {
+    if (!missing(tz)) {
+      arrow_not_supported("Time zone argument")
+    }
+    # `lt` controls the output `lt = TRUE` returns a POSIXlt (which doesn't play
+    # well with mutate, for example)
+    if (lt) {
+      arrow_not_supported("`lt = TRUE` argument")
+    }
+
+    if (cutoff_2000 != 68L) {
+      arrow_not_supported("`cutoff_2000` != 68L argument")
+    }
+
+    # the strptime kernel does not support scalar strings => if we want to be

Review comment:
       In python it does:
   
   ```
   >>> pc.strptime("2022-03-05", format="%Y-%m-%d", unit="us")
   <pyarrow.TimestampScalar: datetime.datetime(2022, 3, 5, 0, 0)>
   ```
   
   so is this an R specific limitation?




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