[GitHub] [arrow] jonkeane commented on a change in pull request #10334: ARROW-12198: [R] bindings for strptime

[GitBox <gi...@apache.org>]

jonkeane commented on a change in pull request #10334:
URL: https://github.com/apache/arrow/pull/10334#discussion_r645808496



##########
File path: r/R/dplyr-functions.R
##########
@@ -338,3 +338,22 @@ get_stringr_pattern_options <- function(pattern) {
 contains_regex <- function(string) {
   grepl("[.\\|()[{^$*+?]", string)
 }
+
+nse_funcs$strptime <- function(x, format = "%Y-%m-%d %H:%M:%S", tz = NULL, unit = "ms") {
+  # Arrow uses unit for time parsing, strptime() does not.
+  # Arrow has no default option for strptime (format, unit),
+  # we suggest following format = "%Y-%m-%d %H:%M:%S", unit = MILLI/1L/"ms",
+  # (ARROW-12809)
+
+  # ParseTimestampStrptime currently ignores the timezone information (ARROW-12820).
+  # Stop if tz is provided.
+  if (is.character(tz)) {
+    arrow_not_supported("Time zone argument")
+  }
+
+  unit <- make_valid_time_unit(unit, c(valid_time64_units, valid_time32_units))
+
+  Expression$create("strptime", 
+                     x, 
+                     options = list(format = format, unit = unit))

Review comment:
       ```suggestion
     Expression$create("strptime", x, options = list(format = format, unit = unit))
   ```




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