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Attached is a patch that limits the range tested by horology to

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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";

John Cochran
This commit is contained in:
Bruce Momjian
2003-03-20 06:03:00 +00:00
parent be1c6e7529
commit d7f10705b4
5 changed files with 74 additions and 71 deletions
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5
src/backend/utils/adt/timestamp.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/timestamp.c,v 1.80 2003/03/11 21:01:33 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/timestamp.c,v 1.81 2003/03/20 06:02:59 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -964,6 +964,9 @@ tm2timestamp(struct tm * tm, fsec_t fsec, int *tzp, Timestamp *result)
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