On Oct 2, 2013, at 5:07 AM, Merlin Moncure mmonc...@gmail.com wrote:
Hrm. I get a seq scan for that query:
create index on try(upper_inf(irange));
explain select * from try where upper_inf(irange);
QUERY PLAN
David,
But anyway, I still don’t understand why, if the function used to store the
value is immutable (as upper_inf() is), why Postgres doesn't do an index
scan. Is this something that could be improved in the planner?
Yes. This is clearly a TODO.
--
Josh Berkus
PostgreSQL Experts Inc.
On Oct 3, 2013, at 10:50 AM, Josh Berkus j...@agliodbs.com wrote:
But anyway, I still don’t understand why, if the function used to store the
value is immutable (as upper_inf() is), why Postgres doesn't do an index
scan. Is this something that could be improved in the planner?
Yes.
On Tuesday, October 1, 2013, David E. Wheeler da...@justatheory.com wrote:
On Oct 1, 2013, at 3:56 PM, Merlin Moncure mmonc...@gmail.com wrote:
I don't think it has anything to do with the conditional index -- it's
the functional based. For some reason postgres always wants to post
filter
Hackers,
I was trying to figure out why a query was not doing an index-only scan on a
partial index, when Josh Berkus pointed to this issue, reported by Merlin
Moncure:
http://www.postgresql.org/message-id/CAHyXU0x1OGao48WajAfUsbXqkUDLf=_6ho6hlmb8dsfkwda...@mail.gmail.com
In short, the
On Tue, Oct 1, 2013 at 5:35 PM, David E. Wheeler da...@justatheory.com wrote:
Hackers,
I was trying to figure out why a query was not doing an index-only scan on a
partial index, when Josh Berkus pointed to this issue, reported by Merlin
Moncure:
On Oct 1, 2013, at 3:56 PM, Merlin Moncure mmonc...@gmail.com wrote:
I don't think it has anything to do with the conditional index -- it's
the functional based. For some reason postgres always wants to post
filter (note the filter step below):
postgres=# create index on
