branch-4.1: [Fix](ttz) Fix TIMESTAMPTZ elapsed-time semantics to use UTC #63161#63248
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Problem Summary:
Fix TIMESTAMPTZ handling for elapsed-time semantics.
TIMESTAMPTZ represents an absolute instant. For calculations that depend
on the elapsed interval between two timestamps, such as time diff
functions and time-window matching logic, Doris should use the stored
UTC time values directly. This follows PostgreSQL-style semantics and
avoids treating TIMESTAMPTZ as local DATETIME before calculation.
### Before
The previous behavior could fall back to TIMESTAMPTZ-to-DATETIME
conversion before evaluating elapsed-time logic. That conversion depends
on the session time zone and produces local wall-clock time.
This is unstable around daylight saving time transitions. During DST
fall-back or spring-forward, local wall-clock time can repeat or skip,
so two TIMESTAMPTZ values with a fixed UTC interval may produce
different or unexpected elapsed-time results after conversion to
DATETIME.
```sql
Doris> SET time_zone = '+00:00';
Doris> SELECT milliseconds_diff(
-> CAST('2024-11-03 01:05:00 -05:00' AS TIMESTAMPTZ(6)),
-> CAST('2024-11-03 01:55:00 -04:00' AS TIMESTAMPTZ(6))) AS ms_utc;
+--------+
| ms_utc |
+--------+
| 600000 |
+--------+
Doris> SET time_zone = 'America/New_York';
-- 内部计算 cast 成 datetime(local_time), 在夏令时/冬令时转换节点结果不稳定)
Doris> SELECT milliseconds_diff(
-> CAST('2024-11-03 01:05:00 -05:00' AS TIMESTAMPTZ(6)),
-> CAST('2024-11-03 01:55:00 -04:00' AS TIMESTAMPTZ(6))) AS ms_ny;
+----------+
| ms_ny |
+----------+
| -3000000 |
+----------+
```
### Now
Handle TIMESTAMPTZ directly in affected elapsed-time paths, including
scalar time interval calculations and time-window matching logic, so
they operate on UTC values instead of local DATETIME values.
Add regression coverage for DST transition cases to verify that results
are based on absolute UTC elapsed time.
```sql
Doris> SET time_zone = 'America/New_York';
Doris> SELECT milliseconds_diff(
-> CAST('2024-11-03 01:05:00 -05:00' AS TIMESTAMPTZ(6)),
-> CAST('2024-11-03 01:55:00 -04:00' AS TIMESTAMPTZ(6))) AS ms_ny;
+--------+
| ms_ny |
+--------+
| 600000 |
+--------+
```
Contributor
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Thank you for your contribution to Apache Doris. Please clearly describe your PR:
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Contributor
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FE Regression Coverage ReportIncrement line coverage |
yiguolei
approved these changes
May 15, 2026
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Cherry-picked from #63161