diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/utils/adt/timestamp.c | 14 | ||||
| -rw-r--r-- | src/test/regress/expected/interval.out | 4 |
2 files changed, 12 insertions, 6 deletions
diff --git a/src/backend/utils/adt/timestamp.c b/src/backend/utils/adt/timestamp.c index da73796eac8..552b631ba78 100644 --- a/src/backend/utils/adt/timestamp.c +++ b/src/backend/utils/adt/timestamp.c @@ -5308,10 +5308,16 @@ interval_part_common(PG_FUNCTION_ARGS, bool retnumeric) int64 secs_from_day_month; int64 val; - /* this always fits into int64 */ - secs_from_day_month = ((int64) DAYS_PER_YEAR * (interval->month / MONTHS_PER_YEAR) + - (int64) DAYS_PER_MONTH * (interval->month % MONTHS_PER_YEAR) + - interval->day) * SECS_PER_DAY; + /* + * To do this calculation in integer arithmetic even though + * DAYS_PER_YEAR is fractional, multiply everything by 4 and then + * divide by 4 again at the end. This relies on DAYS_PER_YEAR + * being a multiple of 0.25 and on SECS_PER_DAY being a multiple + * of 4. + */ + secs_from_day_month = ((int64) (4 * DAYS_PER_YEAR) * (interval->month / MONTHS_PER_YEAR) + + (int64) (4 * DAYS_PER_MONTH) * (interval->month % MONTHS_PER_YEAR) + + (int64) 4 * interval->day) * (SECS_PER_DAY / 4); /*--- * result = secs_from_day_month + interval->time / 1'000'000 diff --git a/src/test/regress/expected/interval.out b/src/test/regress/expected/interval.out index 03f77c01dcf..00885acd1df 100644 --- a/src/test/regress/expected/interval.out +++ b/src/test/regress/expected/interval.out @@ -1655,11 +1655,11 @@ SELECT f1, @ 1 min | 0 | 0.000 | 0.000000 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 60.000000 @ 5 hours | 0 | 0.000 | 0.000000 | 0 | 5 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 18000.000000 @ 10 days | 0 | 0.000 | 0.000000 | 0 | 0 | 10 | 0 | 1 | 0 | 0 | 0 | 0 | 864000.000000 - @ 34 years | 0 | 0.000 | 0.000000 | 0 | 0 | 0 | 0 | 1 | 34 | 3 | 0 | 0 | 1072224000.000000 + @ 34 years | 0 | 0.000 | 0.000000 | 0 | 0 | 0 | 0 | 1 | 34 | 3 | 0 | 0 | 1072958400.000000 @ 3 mons | 0 | 0.000 | 0.000000 | 0 | 0 | 0 | 3 | 2 | 0 | 0 | 0 | 0 | 7776000.000000 @ 14 secs ago | -14000000 | -14000.000 | -14.000000 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | -14.000000 @ 1 day 2 hours 3 mins 4 secs | 4000000 | 4000.000 | 4.000000 | 3 | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 93784.000000 - @ 6 years | 0 | 0.000 | 0.000000 | 0 | 0 | 0 | 0 | 1 | 6 | 0 | 0 | 0 | 189216000.000000 + @ 6 years | 0 | 0.000 | 0.000000 | 0 | 0 | 0 | 0 | 1 | 6 | 0 | 0 | 0 | 189345600.000000 @ 5 mons | 0 | 0.000 | 0.000000 | 0 | 0 | 0 | 5 | 2 | 0 | 0 | 0 | 0 | 12960000.000000 @ 5 mons 12 hours | 0 | 0.000 | 0.000000 | 0 | 12 | 0 | 5 | 2 | 0 | 0 | 0 | 0 | 13003200.000000 (10 rows) |