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Adjust the parser to accept the typename syntax INTERVAL ... SECOND(n)

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and the literal syntax INTERVAL 'string' ... SECOND(n), as required by the
SQL standard.  Our old syntax put (n) directly after INTERVAL, which was
a mistake, but will still be accepted for backward compatibility as well
as symmetry with the TIMESTAMP cases.

Change intervaltypmodout to show it in the spec's way, too.  (This could
potentially affect clients, if there are any that analyze the typmod of an
INTERVAL in any detail.)

Also fix interval input to handle 'min:sec.frac' properly; I had overlooked
this case in my previous patch.

Document the use of the interval fields qualifier, which up to now we had
never mentioned in the docs.  (I think the omission was intentional because
it didn't work per spec; but it does now, or at least close enough to be
credible.)
This commit is contained in:
Tom Lane
2008-09-11 15:27:30 +00:00
parent d53a56687f
commit 70530c808b
6 changed files with 294 additions and 56 deletions
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6
src/backend/utils/adt/timestamp.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.191 2008/09/10 18:29:41 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.192 2008/09/11 15:27:30 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -744,7 +744,7 @@ intervaltypmodin(PG_FUNCTION_ARGS)
tl = ArrayGetIntegerTypmods(ta, &n);
/*
* tl[0] - opt_interval tl[1] - Iconst (optional)
* tl[0] - interval range (fields bitmask) tl[1] - precision (optional)
*
* Note we must validate tl[0] even though it's normally guaranteed
* correct by the grammar --- consider SELECT 'foo'::"interval"(1000).
@ -881,7 +881,7 @@ intervaltypmodout(PG_FUNCTION_ARGS)
}
if (precision != INTERVAL_FULL_PRECISION)
snprintf(res, 64, "(%d)%s", precision, fieldstr);
snprintf(res, 64, "%s(%d)", fieldstr, precision);
else
snprintf(res, 64, "%s", fieldstr);