Patch to fix horology regression failure

Greetings,

Attached is a patch that limits the range tested by horology to
what is capable using integer-datatime timestamps. It does attempt
to exercise the maximum allowable timestamp range.
Also is a small error check when converting a timestamp from external
to internal format that prevents out of range timestamps from being
entered.

Files patched:
Index: src/backend/utils/adt/timestamp.c
Added range check to prevent out of range timestamps
from being used.

Index: src/test/regress/sql/horology.sql
Index: src/test/regress/expected/horology-no-DST-before-1970.out
Index: src/test/regress/expected/horology-solaris-1947.out
Limited range of timestamps being checked to
Jan 1, 4713 BC to Dec 31, 294276

In creating this patch, I have seen some definite problems with integer
timestamps and how they react when used near their limits. For example,
the following statement gives the correct result:

SELECT timestamp without time zone 'Jan 1, 4713 BC'
+ interval '109203489 days' AS "Dec 31, 294276";

However, this statement which is the logical inverse of the above
gives incorrect results:

SELECT timestamp without time zone '12/31/294276'
- timestamp without time zone 'Jan 1, 4713 BC' AS "109203489 Days";

Index: src/backend/utils/adt/timestamp.c
===================================================================
RCS file: /projects/cvsroot/pgsql-server/src/backend/utils/adt/timestamp.c,v
retrieving revision 1.78
diff -c -r1.78 timestamp.c
*** src/backend/utils/adt/timestamp.c 2003/02/22 05:57:45 1.78
--- src/backend/utils/adt/timestamp.c 2003/02/26 02:47:28
***************
*** 964,969 ****
--- 964,972 ----
time = time2t(tm->tm_hour, tm->tm_min, tm->tm_sec, fsec);
#ifdef HAVE_INT64_TIMESTAMP
*result = ((date * INT64CONST(86400000000)) + time);
+ if ((*result < 0 && date >= 0) || (*result >= 0 && date < 0))
+ elog(ERROR, "TIMESTAMP out of range '%04d-%02d-%02d'",
+ tm->tm_year, tm->tm_mon, tm->tm_mday);
#else
*result = ((date * 86400) + time);
#endif
Index: src/test/regress/expected/horology-no-DST-before-1970.out
===================================================================
RCS file: /projects/cvsroot/pgsql-server/src/test/regress/expected/horology-no-DST-before-1970.out,v
retrieving revision 1.28
diff -c -r1.28 horology-no-DST-before-1970.out
*** src/test/regress/expected/horology-no-DST-before-1970.out 2003/02/19 03:48:10 1.28
--- src/test/regress/expected/horology-no-DST-before-1970.out 2003/02/26 02:47:30
***************
*** 328,355 ****
Fri Dec 31 23:59:59 1999
(1 row)

! SELECT timestamp without time zone 'Nov 24, 4714 BC' + interval '1000000000 days' AS "Nov 27, 2733194";
! Nov 27, 2733194
! -----------------------------
! Sun Nov 27 00:00:00 2733194
! (1 row)
!
! SELECT timestamp without time zone 'Nov 24, 4714 BC' + interval '2000000000 days' AS "Nov 30, 5471101";
! Nov 30, 5471101
! -----------------------------
! Sat Nov 30 00:00:00 5471101
! (1 row)
!
! SELECT timestamp without time zone 'Nov 25, 4714 BC' + interval '2147483492 days' AS "Dec 31, 5874897";
! Dec 31, 5874897
! -----------------------------
! Tue Dec 31 00:00:00 5874897
! (1 row)
!
! SELECT timestamp without time zone '12/31/5874897' - timestamp without time zone 'Nov 24, 4714 BC' AS "2147483493 Days";
! 2147483493 Days
! -------------------
! @ 2147483493 days
(1 row)

-- Shorthand values
--- 328,355 ----
Fri Dec 31 23:59:59 1999
(1 row)

! SELECT timestamp without time zone 'Jan 1, 4713 BC' + interval '106000000 days' AS "Feb 23, 285506";
! Feb 23, 285506
! ----------------------------
! Fri Feb 23 00:00:00 285506
! (1 row)
!
! SELECT timestamp without time zone 'Jan 1, 4713 BC' + interval '107000000 days' AS "Jan 20, 288244";
! Jan 20, 288244
! ----------------------------
! Sat Jan 20 00:00:00 288244
! (1 row)
!
! SELECT timestamp without time zone 'Jan 1, 4713 BC' + interval '109203489 days' AS "Dec 31, 294276";
! Dec 31, 294276
! ----------------------------
! Sun Dec 31 00:00:00 294276
! (1 row)
!
! SELECT timestamp without time zone '12/31/294276' - timestamp without time zone '12/23/1999' AS "106751991 Days";
! 106751991 Days
! ------------------
! @ 106751991 days
(1 row)

-- Shorthand values
Index: src/test/regress/expected/horology-solaris-1947.out
===================================================================
RCS file: /projects/cvsroot/pgsql-server/src/test/regress/expected/horology-solaris-1947.out,v
retrieving revision 1.22
diff -c -r1.22 horology-solaris-1947.out
*** src/test/regress/expected/horology-solaris-1947.out 2003/02/19 03:48:10 1.22
--- src/test/regress/expected/horology-solaris-1947.out 2003/02/26 02:47:38
***************
*** 328,355 ****
Fri Dec 31 23:59:59 1999
(1 row)

! SELECT timestamp without time zone 'Nov 24, 4714 BC' + interval '1000000000 days' AS "Nov 27, 2733194";
! Nov 27, 2733194
! -----------------------------
! Sun Nov 27 00:00:00 2733194
! (1 row)
!
! SELECT timestamp without time zone 'Nov 24, 4714 BC' + interval '2000000000 days' AS "Nov 30, 5471101";
! Nov 30, 5471101
! -----------------------------
! Sat Nov 30 00:00:00 5471101
! (1 row)
!
! SELECT timestamp without time zone 'Nov 25, 4714 BC' + interval '2147483492 days' AS "Dec 31, 5874897";
! Dec 31, 5874897
! -----------------------------
! Tue Dec 31 00:00:00 5874897
! (1 row)
!
! SELECT timestamp without time zone '12/31/5874897' - timestamp without time zone 'Nov 24, 4714 BC' AS "2147483493 Days";
! 2147483493 Days
! -------------------
! @ 2147483493 days
(1 row)

-- Shorthand values
--- 328,355 ----
Fri Dec 31 23:59:59 1999
(1 row)

! SELECT timestamp without time zone 'Jan 1, 4713 BC' + interval '106000000 days' AS "Feb 23, 285506";
! Feb 23, 285506
! ----------------------------
! Fri Feb 23 00:00:00 285506
! (1 row)
!
! SELECT timestamp without time zone 'Jan 1, 4713 BC' + interval '107000000 days' AS "Jan 20, 288244";
! Jan 20, 288244
! ----------------------------
! Sat Jan 20 00:00:00 288244
! (1 row)
!
! SELECT timestamp without time zone 'Jan 1, 4713 BC' + interval '109203489 days' AS "Dec 31, 294276";
! Dec 31, 294276
! ----------------------------
! Sun Dec 31 00:00:00 294276
! (1 row)
!
! SELECT timestamp without time zone '12/31/294276' - timestamp without time zone '12/23/1999' AS "106751991 Days";
! 106751991 Days
! ------------------
! @ 106751991 days
(1 row)

-- Shorthand values
Index: src/test/regress/expected/horology.out
===================================================================
RCS file: /projects/cvsroot/pgsql-server/src/test/regress/expected/horology.out,v
retrieving revision 1.41
diff -c -r1.41 horology.out
*** src/test/regress/expected/horology.out 2003/02/19 03:48:11 1.41
--- src/test/regress/expected/horology.out 2003/02/26 02:47:49
***************
*** 328,355 ****
Fri Dec 31 23:59:59 1999
(1 row)

! SELECT timestamp without time zone 'Nov 24, 4714 BC' + interval '1000000000 days' AS "Nov 27, 2733194";
! Nov 27, 2733194
! -----------------------------
! Sun Nov 27 00:00:00 2733194
! (1 row)
!
! SELECT timestamp without time zone 'Nov 24, 4714 BC' + interval '2000000000 days' AS "Nov 30, 5471101";
! Nov 30, 5471101
! -----------------------------
! Sat Nov 30 00:00:00 5471101
! (1 row)
!
! SELECT timestamp without time zone 'Nov 25, 4714 BC' + interval '2147483492 days' AS "Dec 31, 5874897";
! Dec 31, 5874897
! -----------------------------
! Tue Dec 31 00:00:00 5874897
! (1 row)
!
! SELECT timestamp without time zone '12/31/5874897' - timestamp without time zone 'Nov 24, 4714 BC' AS "2147483493 Days";
! 2147483493 Days
! -------------------
! @ 2147483493 days
(1 row)

-- Shorthand values
--- 328,355 ----
Fri Dec 31 23:59:59 1999
(1 row)

! SELECT timestamp without time zone 'Jan 1, 4713 BC' + interval '106000000 days' AS "Feb 23, 285506";
! Feb 23, 285506
! ----------------------------
! Fri Feb 23 00:00:00 285506
! (1 row)
!
! SELECT timestamp without time zone 'Jan 1, 4713 BC' + interval '107000000 days' AS "Jan 20, 288244";
! Jan 20, 288244
! ----------------------------
! Sat Jan 20 00:00:00 288244
! (1 row)
!
! SELECT timestamp without time zone 'Jan 1, 4713 BC' + interval '109203489 days' AS "Dec 31, 294276";
! Dec 31, 294276
! ----------------------------
! Sun Dec 31 00:00:00 294276
! (1 row)
!
! SELECT timestamp without time zone '12/31/294276' - timestamp without time zone '12/23/1999' AS "106751991 Days";
! 106751991 Days
! ------------------
! @ 106751991 days
(1 row)

-- Shorthand values
Index: src/test/regress/sql/horology.sql
===================================================================
RCS file: /projects/cvsroot/pgsql-server/src/test/regress/sql/horology.sql,v
retrieving revision 1.26
diff -c -r1.26 horology.sql
*** src/test/regress/sql/horology.sql 2003/02/19 03:48:11 1.26
--- src/test/regress/sql/horology.sql 2003/02/26 02:47:49
***************
*** 76,85 ****
SELECT timestamp without time zone '1999-03-01' - interval '1 second' AS "Feb 28";
SELECT timestamp without time zone '2000-03-01' - interval '1 second' AS "Feb 29";
SELECT timestamp without time zone '1999-12-01' + interval '1 month - 1 second' AS "Dec 31";
! SELECT timestamp without time zone 'Nov 24, 4714 BC' + interval '1000000000 days' AS "Nov 27, 2733194";
! SELECT timestamp without time zone 'Nov 24, 4714 BC' + interval '2000000000 days' AS "Nov 30, 5471101";
! SELECT timestamp without time zone 'Nov 25, 4714 BC' + interval '2147483492 days' AS "Dec 31, 5874897";
! SELECT timestamp without time zone '12/31/5874897' - timestamp without time zone 'Nov 24, 4714 BC' AS "2147483493 Days";

-- Shorthand values
-- Not directly usable for regression testing since these are not constants.
--- 76,85 ----
SELECT timestamp without time zone '1999-03-01' - interval '1 second' AS "Feb 28";
SELECT timestamp without time zone '2000-03-01' - interval '1 second' AS "Feb 29";
SELECT timestamp without time zone '1999-12-01' + interval '1 month - 1 second' AS "Dec 31";
! SELECT timestamp without time zone 'Jan 1, 4713 BC' + interval '106000000 days' AS "Feb 23, 285506";
! SELECT timestamp without time zone 'Jan 1, 4713 BC' + interval '107000000 days' AS "Jan 20, 288244";
! SELECT timestamp without time zone 'Jan 1, 4713 BC' + interval '109203489 days' AS "Dec 31, 294276";
! SELECT timestamp without time zone '12/31/294276' - timestamp without time zone '12/23/1999' AS "106751991 Days";

-- Shorthand values
-- Not directly usable for regression testing since these are not constants.