>>>>> "Tom" == Tom Lane <tgl@sss.pgh.pa.us> writes:
>> ie do you accept interval '1 day 1 hour' day to second
Tom> I think we have to, and the reason is that this isn't
Tom> different under the hood from reading the external value '1
Tom> day 1 hour' and storing it into a column that has the DAY TO
Tom> SECOND typmod.
I don't know anything about the postgres internals, but I don't see it
has to be this way.
INTERVAL '1 day 1 hour' DAY TO SECOND
won't occur in any existing dump file. But if it's important to treat
this the same as casting the string '1 day 1 hour' to type INTERVAL
DAY TO SECOND then yes, you'll have to accept it.
But this is just syntax; I don't see why you have to interpret it that
way...
But on refelction if you want to treat
INTERVAL 'postgres-interval' ansi-interval-type
as equivalent to
CAST (INTERVAL 'postgres-interval' AS INTERVAL ansi-interval-type)
that's probably not unreasonable. Though it creates an inconsistency
with the current (undocumented) postgresism of treating
INTERVAL '1'
as
INTERVAL '1 second'
since clearly you can't treat the ANSI interval
INTERVAL '1' HOUR
as
CAST (INTERVAL '1 second' AS INTERVAL HOUR)
-roy