I'm sure your aware of these limitations, but I'd thought I'd mention
them just in case, and to see if you have plans to sort them out:
I have a query of the form:
SELECT * FROM .... WHERE (now()-date1) > 'interval 1 day';
..i.e. all rows 'older' than 1 day. This could be efficiently
processed using the index on date1, but sadly pg doesn't know this ;-(
This transforms an operation which should be O(1) to O(rows)....
More worryingly, when I investigated the above, I find it doesn't even
use the index for
SELECT * FROM ....
WHERE date1 > '2000-09-11 00:00:00'::datetime - '1 hour'::interval;
...so it doesn't realise that constant-constant is constant,
notwithstanding the more complex issues that now() is pseudo-constant.
This could be fixed by constant folding, I guess; any plans for that?
Jules
