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Allow negative years in make_date to represent BC years

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There doesn't seem to be any reason not to allow negative years to be
interpreted as BC, so do that.

The documentation is pretty vague on the details of this function, so
nothing needs to change there.

Reported-by: Andy Abelisto, in bug #14446
This commit is contained in:
Alvaro Herrera
2017-01-19 09:45:38 -03:00
parent 8b07aee8c5
commit 30bcebbdcf
3 changed files with 16 additions and 8 deletions
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14
src/backend/utils/adt/date.c
View File

@@ -252,16 +252,20 @@ make_date(PG_FUNCTION_ARGS)
struct pg_tm tm;
DateADT date;
int dterr;
bool bc = false;
tm.tm_year = PG_GETARG_INT32(0);
tm.tm_mon = PG_GETARG_INT32(1);
tm.tm_mday = PG_GETARG_INT32(2);
/*
* Note: we'll reject zero or negative year values. Perhaps negatives
* should be allowed to represent BC years?
*/
dterr = ValidateDate(DTK_DATE_M, false, false, false, &tm);
/* Handle negative years as BC */
if (tm.tm_year < 0)
{
bc = true;
tm.tm_year = -tm.tm_year;
}
dterr = ValidateDate(DTK_DATE_M, false, false, bc, &tm);
if (dterr != 0)
ereport(ERROR,

8
src/test/regress/expected/date.out
View File

@@ -1454,6 +1454,12 @@ select make_date(2013, 7, 15);
07-15-2013
(1 row)
select make_date(-44, 3, 15);
make_date
---------------
03-15-0044 BC
(1 row)
select make_time(8, 20, 0.0);
make_time
-----------
@@ -1467,8 +1473,6 @@ select make_date(2013, 13, 1);
ERROR: date field value out of range: 2013-13-01
select make_date(2013, 11, -1);
ERROR: date field value out of range: 2013-11--1
select make_date(-44, 3, 15); -- perhaps we should allow this sometime?
ERROR: date field value out of range: -44-03-15
select make_time(10, 55, 100.1);
ERROR: time field value out of range: 10:55:100.1
select make_time(24, 0, 2.1);

2
src/test/regress/sql/date.sql
View File

@@ -338,11 +338,11 @@ SELECT EXTRACT(UNDEFINED FROM DATE 'infinity'); -- ERROR: timestamp units "
-- test constructors
select make_date(2013, 7, 15);
select make_date(-44, 3, 15);
select make_time(8, 20, 0.0);
-- should fail
select make_date(2013, 2, 30);
select make_date(2013, 13, 1);
select make_date(2013, 11, -1);
select make_date(-44, 3, 15); -- perhaps we should allow this sometime?
select make_time(10, 55, 100.1);
select make_time(24, 0, 2.1);