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# Some exprs on `timestamptz` are implemented by a chain of 3 steps: | ||
# * convert `timestamptz` into naive `timestamp` in the given zone | ||
# * perform actual operation on the naive `timestamp` | ||
# * convert naive `timestamp` in the given zone back to `timestamptz` | ||
# | ||
# This can lead to unintuitive results, because the first and last steps are not perfect inverse. | ||
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# Two different `timestamptz` values collapse into the same naive `timestamp`. | ||
query T | ||
select | ||
'2023-11-05 08:40:00Z'::timestamptz AT TIME ZONE 'US/Pacific', | ||
'2023-11-05 09:40:00Z'::timestamptz AT TIME ZONE 'US/Pacific'; | ||
---- | ||
2023-11-05 01:40:00 2023-11-05 01:40:00 | ||
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# When ambiguous, the `timestamptz` after a jump-back transition is returned. | ||
query T | ||
select '2023-11-05 01:40:00'::timestamp AT TIME ZONE 'US/Pacific'; | ||
---- | ||
2023-11-05 09:40:00+00:00 | ||
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# Tests below are about exprs following the 3-step pattern: | ||
# * `date_trunc(field, timestamptz, zone)` -> `timestamptz` | ||
# * `timestamptz + interval` -> `timestamptz` | ||
# * Also used by `interval + timestamptz` and `timestamptz - interval` | ||
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# (A) intuitive cases without anomalies observed (but require special care behind the scenes) | ||
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query R | ||
with t(id, v) as (values | ||
('a', '2023-11-05 01:40:00-07:00'::timestamptz), | ||
('b', '2023-11-05 01:40:00-08:00'::timestamptz)) | ||
select extract(epoch from date_trunc('hour', v, 'US/Pacific')) from t order by id; | ||
---- | ||
1699171200.000000 | ||
1699174800.000000 | ||
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statement ok | ||
set timezone = 'US/Pacific'; | ||
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query T | ||
with t(id, v) as (values | ||
('a', '2023-11-05 01:40:00-07:00'::timestamptz), | ||
('b', '2023-11-05 01:40:00-08:00'::timestamptz)) | ||
select v + interval '5' minute from t order by id; | ||
---- | ||
2023-11-05 01:45:00-07:00 | ||
2023-11-05 01:45:00-08:00 | ||
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statement ok | ||
set timezone = 'UTC'; | ||
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# (B) common 1-hour jump-back for whole-hour zones | ||
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query R | ||
with t(id, v) as (values | ||
('a', '2023-11-05 01:40:00-07:00'::timestamptz), | ||
('b', '2023-11-05 01:40:00-08:00'::timestamptz)) | ||
select extract(epoch from date_trunc('day', v, 'US/Pacific')) from t order by id; | ||
---- | ||
1699167600.000000 | ||
1699167600.000000 | ||
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statement ok | ||
set timezone = 'US/Pacific'; | ||
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query T | ||
with t(id, v) as (values | ||
('a', '2023-11-05 01:40:00-07:00'::timestamptz), | ||
('b', '2023-11-05 01:40:00-08:00'::timestamptz), | ||
('c', '2023-11-04 01:40:00-07:00'::timestamptz)) | ||
select v + interval '1' day from t order by id; | ||
---- | ||
2023-11-06 01:40:00-08:00 | ||
2023-11-06 01:40:00-08:00 | ||
2023-11-05 01:40:00-08:00 | ||
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statement ok | ||
set timezone = 'UTC'; | ||
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# (C) 1-hour jump-back for half-hour zones | ||
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query T | ||
with t(id, v) as (values | ||
('a', '2023-04-01 15:58:00Z'::timestamptz), | ||
('b', '2023-04-01 16:58:00Z'::timestamptz)) | ||
select date_trunc('hour', v, 'Australia/South') from t order by id; | ||
---- | ||
2023-04-01 15:30:00+00:00 | ||
2023-04-01 16:30:00+00:00 | ||
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# (D) half-hour jump-back | ||
# Note that `01:45:00+10:30` is truncated to non-existent `01:00:00+10:30` whose canonical form is `01:30:00+11:00` | ||
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statement ok | ||
set timezone = 'Australia/Lord_Howe'; | ||
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query TTT | ||
with t(id, v) as (values | ||
('a', '2023-04-01 14:45:00Z'::timestamptz), | ||
('b', '2023-04-01 15:15:00Z'::timestamptz)) | ||
select date_trunc('hour', v, 'Australia/Lord_Howe'), 'truncated from', v from t order by id; | ||
---- | ||
2023-04-02 01:00:00+11:00 truncated from 2023-04-02 01:45:00+11:00 | ||
2023-04-02 01:30:00+11:00 truncated from 2023-04-02 01:45:00+10:30 | ||
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statement ok | ||
set timezone = 'UTC'; | ||
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# (E) jump-back to day boundary, making it ambiguous | ||
# Due to the disambiguation rule selecting post-transition value, | ||
# `date_trunc` effectively returns an instant in the future, rather than the past. | ||
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query T | ||
with t(id, v) as (values | ||
('a', '2023-11-05 04:40:00Z'::timestamptz), | ||
('b', '2023-11-05 05:40:00Z'::timestamptz)) | ||
select date_trunc('day', v, 'America/Havana') from t order by id; | ||
---- | ||
2023-11-05 05:00:00+00:00 | ||
2023-11-05 05:00:00+00:00 | ||
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# (F) jump-forward from day boundary, making it invalid | ||
# Here `2023-09-02 23:59:59-04:00` is followed by `2023-09-03 01:00:00-03:00`. | ||
# There is no `2023-09-03 00:00:00-04:00` or `2023-09-03 00:00:00-03:00`. | ||
# PostgreSQL returns `2023-09-03 01:00:00-03:00` but it is hard using `chrono` crate. | ||
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statement error interpret | ||
select date_trunc('day', '2023-09-03 12:00:00Z'::timestamptz, 'America/Santiago'); |
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