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Change behaviour of toStartOfInterval in backward incompatible way
This commit is contained in:
Alexey Milovidov
parent
c19045da25
commit
5a2f2e0cc8
@ -853,15 +853,43 @@ public:
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{
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if (hours == 1)
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return toStartOfHour(t);
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/** We will round the hour number since the midnight.
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* It may split the day into non-equal intervals.
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* For example, if we will round to 11-hour interval,
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* the day will be split to the intervals 00:00:00..10:59:59, 11:00:00..21:59:59, 22:00:00..23:59:59.
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* In case of daylight saving time or other transitions,
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* the intervals can be shortened or prolonged to the amount of transition.
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*/
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UInt64 seconds = hours * 3600;
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t = roundDown(t, seconds);
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const LUTIndex index = findIndex(t);
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const Values & values = lut[index];
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if (t >= 0 && offset_is_whole_number_of_hours_during_epoch)
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return t;
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time_t time = t - values.date;
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if (time >= values.time_at_offset_change())
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{
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/// Align to new hour numbers before rounding.
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time += values.amount_of_offset_change();
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time = time / seconds * seconds;
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/// TODO check if it's correct.
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return toStartOfHour(t);
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/// Should substract the shift back but only if rounded time is not before shift.
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if (time >= values.time_at_offset_change())
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{
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time -= values.amount_of_offset_change();
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/// With cutoff at the time of the shift. Otherwise we may end up with something like 23:00 previous day.
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if (time < values.time_at_offset_change())
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time = values.time_at_offset_change();
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}
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}
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else
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{
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time = time / seconds * seconds;
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}
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return values.date + time;
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}
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inline time_t toStartOfMinuteInterval(time_t t, UInt64 minutes) const
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@ -869,6 +897,14 @@ public:
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if (minutes == 1)
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return toStartOfMinute(t);
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/** In contrast to "toStartOfHourInterval" function above,
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* the minute intervals are not aligned to the midnight.
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* You will get unexpected results if for example, you round down to 60 minute interval
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* and there was a time shift to 30 minutes.
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*
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* But this is not specified in docs and can be changed in future.
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*/
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UInt64 seconds = 60 * minutes;
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return roundDown(t, seconds);
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}
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@ -0,0 +1,86 @@
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2021-03-23 00:00:00
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2021-03-23 11:00:00
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2021-03-23 22:00:00
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2021-03-23 13:00:00
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2021-03-23 12:00:00
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2021-03-23 00:00:00
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2010-03-28 00:00:00 2010-03-28 00:00:00 1269723600
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2010-03-28 00:15:00 2010-03-28 00:00:00 1269724500
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2010-03-28 00:30:00 2010-03-28 00:00:00 1269725400
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2010-03-28 00:45:00 2010-03-28 00:00:00 1269726300
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2010-03-28 01:00:00 2010-03-28 00:00:00 1269727200
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2010-03-28 01:15:00 2010-03-28 00:00:00 1269728100
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2010-03-28 01:30:00 2010-03-28 00:00:00 1269729000
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2010-03-28 01:45:00 2010-03-28 00:00:00 1269729900
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2010-03-28 03:00:00 2010-03-28 03:00:00 1269730800
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2010-03-28 03:15:00 2010-03-28 03:00:00 1269731700
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2010-03-28 03:30:00 2010-03-28 03:00:00 1269732600
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2010-03-28 03:45:00 2010-03-28 03:00:00 1269733500
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2010-03-28 04:00:00 2010-03-28 04:00:00 1269734400
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2010-03-28 04:15:00 2010-03-28 04:00:00 1269735300
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2010-03-28 04:30:00 2010-03-28 04:00:00 1269736200
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2010-03-28 04:45:00 2010-03-28 04:00:00 1269737100
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2010-03-28 05:00:00 2010-03-28 04:00:00 1269738000
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2010-03-28 05:15:00 2010-03-28 04:00:00 1269738900
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2010-03-28 05:30:00 2010-03-28 04:00:00 1269739800
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2010-03-28 05:45:00 2010-03-28 04:00:00 1269740700
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2010-10-31 00:00:00 2010-10-31 00:00:00 1288468800
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2010-10-31 00:15:00 2010-10-31 00:00:00 1288469700
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2010-10-31 00:30:00 2010-10-31 00:00:00 1288470600
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2010-10-31 00:45:00 2010-10-31 00:00:00 1288471500
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2010-10-31 01:00:00 2010-10-31 00:00:00 1288472400
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2010-10-31 01:15:00 2010-10-31 00:00:00 1288473300
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2010-10-31 01:30:00 2010-10-31 00:00:00 1288474200
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2010-10-31 01:45:00 2010-10-31 00:00:00 1288475100
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2010-10-31 02:00:00 2010-10-31 02:00:00 1288476000
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2010-10-31 02:15:00 2010-10-31 02:00:00 1288476900
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2010-10-31 02:30:00 2010-10-31 02:00:00 1288477800
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2010-10-31 02:45:00 2010-10-31 02:00:00 1288478700
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2010-10-31 02:00:00 2010-10-31 02:00:00 1288479600
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2010-10-31 02:15:00 2010-10-31 02:00:00 1288480500
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2010-10-31 02:30:00 2010-10-31 02:00:00 1288481400
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2010-10-31 02:45:00 2010-10-31 02:00:00 1288482300
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2010-10-31 03:00:00 2010-10-31 02:00:00 1288483200
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2010-10-31 03:15:00 2010-10-31 02:00:00 1288484100
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2010-10-31 03:30:00 2010-10-31 02:00:00 1288485000
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2010-10-31 03:45:00 2010-10-31 02:00:00 1288485900
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2020-04-05 00:00:00 2020-04-05 00:00:00 1586005200
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2020-04-05 00:15:00 2020-04-05 00:00:00 1586006100
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2020-04-05 00:30:00 2020-04-05 00:00:00 1586007000
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2020-04-05 00:45:00 2020-04-05 00:00:00 1586007900
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2020-04-05 01:00:00 2020-04-05 00:00:00 1586008800
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2020-04-05 01:15:00 2020-04-05 00:00:00 1586009700
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2020-04-05 01:30:00 2020-04-05 00:00:00 1586010600
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2020-04-05 01:45:00 2020-04-05 00:00:00 1586011500
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2020-04-05 01:30:00 2020-04-05 00:00:00 1586012400
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2020-04-05 01:45:00 2020-04-05 00:00:00 1586013300
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2020-04-05 02:00:00 2020-04-05 02:00:00 1586014200
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2020-04-05 02:15:00 2020-04-05 02:00:00 1586015100
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2020-04-05 02:30:00 2020-04-05 02:00:00 1586016000
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2020-04-05 02:45:00 2020-04-05 02:00:00 1586016900
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2020-04-05 03:00:00 2020-04-05 02:00:00 1586017800
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2020-04-05 03:15:00 2020-04-05 02:00:00 1586018700
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2020-04-05 03:30:00 2020-04-05 02:00:00 1586019600
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2020-04-05 03:45:00 2020-04-05 02:00:00 1586020500
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2020-04-05 04:00:00 2020-04-05 04:00:00 1586021400
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2020-04-05 04:15:00 2020-04-05 04:00:00 1586022300
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2020-10-04 00:00:00 2020-10-04 00:00:00 1601731800
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2020-10-04 00:15:00 2020-10-04 00:00:00 1601732700
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2020-10-04 00:30:00 2020-10-04 00:00:00 1601733600
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2020-10-04 00:45:00 2020-10-04 00:00:00 1601734500
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2020-10-04 01:00:00 2020-10-04 00:00:00 1601735400
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2020-10-04 01:15:00 2020-10-04 00:00:00 1601736300
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2020-10-04 01:30:00 2020-10-04 00:00:00 1601737200
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2020-10-04 01:45:00 2020-10-04 00:00:00 1601738100
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2020-10-04 02:30:00 2020-10-04 02:30:00 1601739000
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2020-10-04 02:45:00 2020-10-04 02:30:00 1601739900
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2020-10-04 03:00:00 2020-10-04 02:30:00 1601740800
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2020-10-04 03:15:00 2020-10-04 02:30:00 1601741700
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2020-10-04 03:30:00 2020-10-04 02:30:00 1601742600
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2020-10-04 03:45:00 2020-10-04 02:30:00 1601743500
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2020-10-04 04:00:00 2020-10-04 04:00:00 1601744400
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2020-10-04 04:15:00 2020-10-04 04:00:00 1601745300
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2020-10-04 04:30:00 2020-10-04 04:00:00 1601746200
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2020-10-04 04:45:00 2020-10-04 04:00:00 1601747100
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2020-10-04 05:00:00 2020-10-04 04:00:00 1601748000
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2020-10-04 05:15:00 2020-10-04 04:00:00 1601748900
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21
tests/queries/0_stateless/01772_to_start_of_hour_align.sql
Normal file
21
tests/queries/0_stateless/01772_to_start_of_hour_align.sql
Normal file
@ -0,0 +1,21 @@
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-- Rounding down to hour intervals is aligned to midnight even if the interval length does not divide the whole day.
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SELECT toStartOfInterval(toDateTime('2021-03-23 03:58:00'), INTERVAL 11 HOUR);
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SELECT toStartOfInterval(toDateTime('2021-03-23 13:58:00'), INTERVAL 11 HOUR);
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SELECT toStartOfInterval(toDateTime('2021-03-23 23:58:00'), INTERVAL 11 HOUR);
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-- It should work correctly even in timezones with non-whole hours offset. India have +05:30.
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SELECT toStartOfHour(toDateTime('2021-03-23 13:58:00', 'Asia/Kolkata'));
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SELECT toStartOfInterval(toDateTime('2021-03-23 13:58:00', 'Asia/Kolkata'), INTERVAL 6 HOUR);
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-- Specifying the interval longer than 24 hours is not correct, but it works as expected by just rounding to midnight.
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SELECT toStartOfInterval(toDateTime('2021-03-23 13:58:00', 'Asia/Kolkata'), INTERVAL 66 HOUR);
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-- In case of timezone shifts, rounding is performed to the hour number on "wall clock" time.
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-- The intervals may become shorter or longer due to time shifts. For example, the three hour interval may actually last two hours.
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-- If the same hour number on "wall clock" time correspond to multiple time points due to shifting backwards, the unspecified time point is selected among the candidates.
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SELECT toDateTime('2010-03-28 00:00:00', 'Europe/Moscow') + INTERVAL 15 * number MINUTE AS src, toStartOfInterval(src, INTERVAL 2 HOUR) AS rounded, toUnixTimestamp(src) AS t FROM numbers(20);
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SELECT toDateTime('2010-10-31 00:00:00', 'Europe/Moscow') + INTERVAL 15 * number MINUTE AS src, toStartOfInterval(src, INTERVAL 2 HOUR) AS rounded, toUnixTimestamp(src) AS t FROM numbers(20);
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-- And this should work even for non whole number of hours shifts.
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SELECT toDateTime('2020-04-05 00:00:00', 'Australia/Lord_Howe') + INTERVAL 15 * number MINUTE AS src, toStartOfInterval(src, INTERVAL 2 HOUR) AS rounded, toUnixTimestamp(src) AS t FROM numbers(20);
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SELECT toDateTime('2020-10-04 00:00:00', 'Australia/Lord_Howe') + INTERVAL 15 * number MINUTE AS src, toStartOfInterval(src, INTERVAL 2 HOUR) AS rounded, toUnixTimestamp(src) AS t FROM numbers(20);
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