jorisvandenbossche commented on a change in pull request #10610:
URL: https://github.com/apache/arrow/pull/10610#discussion_r670426594
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File path: cpp/src/arrow/compute/kernels/scalar_temporal.cc
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@@ -321,6 +341,77 @@ struct Nanosecond {
}
};
+// ----------------------------------------------------------------------
+// Convert timestamps from arbitrary timezone to UTC
+
+template <typename Duration>
+struct TzLocalize {
+ explicit TzLocalize(const TemporalLocalizationOptions& options)
+ : options(std::move(options)) {}
+
+ template <typename T, typename Arg0>
+ T get_local_time(Arg0 arg) const {
+ return static_cast<T>(
+ arrow_vendored::date::zoned_time<Duration>(
+ options.tz,
arrow_vendored::date::local_time<Duration>(Duration{arg}))
+ .get_sys_time()
+ .time_since_epoch()
+ .count());
+ }
+
+ template <typename T, typename Arg0>
+ T get_local_time(Arg0 arg, const arrow_vendored::date::choose choose) const {
+ return static_cast<T>(
+ arrow_vendored::date::zoned_time<Duration>(
+ options.tz,
arrow_vendored::date::local_time<Duration>(Duration{arg}), choose)
+ .get_sys_time()
+ .time_since_epoch()
+ .count());
+ }
+
+ template <typename T, typename Arg0>
+ T Call(KernelContext*, Arg0 arg, Status* st) const {
+ try {
+ return get_local_time<T, Arg0>(arg);
+ } catch (const arrow_vendored::date::nonexistent_local_time& e) {
+ switch (options.nonexistent) {
+ case TemporalLocalizationOptions::Nonexistent::RAISE_NONEXISTENT: {
+ *st = Status::Invalid("Nonexistent: ", e.what());
+ return arg;
+ }
+ case TemporalLocalizationOptions::Nonexistent::SHIFT_BACKWARD: {
+ return get_local_time<T, Arg0>(arg,
arrow_vendored::date::choose::earliest);
+ }
+ case TemporalLocalizationOptions::Nonexistent::SHIFT_FORWARD: {
+ return get_local_time<T, Arg0>(arg,
arrow_vendored::date::choose::latest);
+ }
+ case TemporalLocalizationOptions::Nonexistent::IGNORE_NONEXISTENT: {
+ return static_cast<T>(NULL);
+ }
+ }
+ } catch (const arrow_vendored::date::ambiguous_local_time& e) {
+ switch (options.ambiguous) {
+ case TemporalLocalizationOptions::Ambiguous::RAISE_AMBIGUOUS: {
+ *st = Status::Invalid("Ambiguous: ", e.what());
+ return arg;
+ }
+ case TemporalLocalizationOptions::Ambiguous::FIRST: {
+ return get_local_time<T, Arg0>(arg,
arrow_vendored::date::choose::earliest);
+ }
+ case TemporalLocalizationOptions::Ambiguous::LAST: {
+ return get_local_time<T, Arg0>(arg,
arrow_vendored::date::choose::latest);
Review comment:
For `nonexistent`, we use "shift_backward" and "shift_forward" for
earliest/latest, and here we use "first" and "last" for the `ambiguous`
keyword. Shall we make this consistent? (and could then also use the
terminology of date.h)
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