From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
Cc: | Jeff Davis <pgsql(at)j-davis(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, "David E(dot) Wheeler" <david(at)kineticode(dot)com>, lembark(at)wrkhors(dot)com, pgsql-hackers(at)postgresql(dot)org, pgsql-www(at)postgresql(dot)org |
Subject: | Re: [HACKERS] Mentors needed urgently for SoC & PostgreSQL Student Internships |
Date: | 2009-04-02 20:07:04 |
Message-ID: | 603c8f070904021307h5d9fc9a6oa29183aee7e77fd9@mail.gmail.com |
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Lists: | pgsql-hackers pgsql-www |
On Thu, Apr 2, 2009 at 2:58 PM, Heikki Linnakangas
<heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
> Also, it would be nice to generalize the thing so that it works not only
> with intervals of time, but also floats, integers, numerics etc. The concept
> of an interval is not really tied to timestamps, even though that's probably
> the most common use case in the business world.
Suddenly this thread has my undivided attention.
A does-not-overlap operator would be awesome. A does-not-overlap
index on a column whose value is a range would be awesome beyond
words.
As a simple example, consider an application whose job is to allocate
subnets out of some larger IP block. Today, I typically handle cases
of this type by defining triggers that generate the ends of the range
and all the intermediate values and insert them into a side table with
a unique index. It's really the pits, and unworkable for large
ranges.
...Robert
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