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Code Issues

Improvement CORE-6058 - Change behavior of skipped and repeated wall times within time zones.

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This commit is contained in:
Adriano dos Santos Fernandes 2019-05-01 16:32:29 -03:00
parent b656c3ae84
commit 9c76811fae
4 changed files with 7 additions and 0 deletions
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2
doc/sql.extensions/README.time_zone.md
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@ -14,6 +14,8 @@ A time zone may be a string with a time zone region (for example, `America/Sao_P
A time/timestamp with time zone is considered equal to another time/timestamp with time zone if their conversion to UTC are equal, for example, `time '10:00 -02' = time '09:00 -03'`, since both are the same as `time '12:00 GMT'`. This is also valid in the context of `UNIQUE` constraints and for sorting purposes.
Some timestamps does not exist (DST starting) or repeats twice (DST ending). For the first case, when DST starts in America/New_York, 2:30 AM on March 12, 2017 does not exist and is interpreted as 2:30 AM UTC-05 (equivalent to 3:30 AM UTC-04). For the second case, when DST ends in America/New_York, 1:30 AM on November 5, 2017 repeats twice and is interpreted as 1:30 AM UTC-04 instead of 1:30 AM UTC-05.
## Data types

3
src/common/TimeZoneUtil.cpp
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@ -564,6 +564,9 @@ void TimeZoneUtil::localTimeStampToUtc(ISC_TIMESTAMP_TZ& timeStampTz)
if (!icuCalendar)
status_exception::raise(Arg::Gds(isc_random) << "Error calling ICU's ucal_open.");
icuLib.ucalSetAttribute(icuCalendar, UCAL_REPEATED_WALL_TIME, UCAL_WALLTIME_FIRST);
icuLib.ucalSetAttribute(icuCalendar, UCAL_SKIPPED_WALL_TIME, UCAL_WALLTIME_FIRST);
icuLib.ucalSetDateTime(icuCalendar, 1900 + times.tm_year, times.tm_mon, times.tm_mday,
times.tm_hour, times.tm_min, times.tm_sec, &icuErrorCode);

1
src/common/unicode_util.cpp
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@ -288,6 +288,7 @@ private:
getEntryPoint("ucal_getDefaultTimeZone", inModule, ucalGetDefaultTimeZone);
getEntryPoint("ucal_open", inModule, ucalOpen);
getEntryPoint("ucal_close", inModule, ucalClose);
getEntryPoint("ucal_setAttribute", inModule, ucalSetAttribute);
getEntryPoint("ucal_setMillis", inModule, ucalSetMillis);
getEntryPoint("ucal_get", inModule, ucalGet);
getEntryPoint("ucal_setDateTime", inModule, ucalSetDateTime);

1
src/common/unicode_util.h
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@ -128,6 +128,7 @@ public:
UCalendar* (U_EXPORT2* ucalOpen) (const UChar* zoneID, int32_t len, const char* locale, UCalendarType type,
UErrorCode* err);
void (U_EXPORT2* ucalClose) (UCalendar* cal);
void (U_EXPORT2* ucalSetAttribute) (UCalendar* cal, UCalendarAttribute attr, int32_t newValue);
void (U_EXPORT2* ucalSetMillis) (UCalendar* cal, UDate dateTime, UErrorCode* err);
int32_t (U_EXPORT2* ucalGet) (UCalendar* cal, UCalendarDateFields field, UErrorCode* err);
void (U_EXPORT2* ucalSetDateTime) (UCalendar* cal, int32_t year, int32_t month, int32_t date, int32_t hour,