Re: Grouped Index Tuples

Heikki, are you going to revise this for 8.4?

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Heikki Linnakangas wrote:
> I've brought the GIT patch up-to-date with CVS head. The latest version
> can be found at http://community.enterprisedb.com/git/
>
> I also reran the CPU bound test cases with the latest patch.
>
> I want this in 8.3 in some form, and I have the time to do any required
> changes. If someone wants to see more tests, I can arrange that as well.
>
> The patch is pretty big at the moment. I think the best way to proceed
> with this is to extract some smaller, incremental patches from it that
> just refactor the current b-tree code. After that, the final patch that
> implements GIT should be much smaller and more readable. And there's
> still a bunch of todo items there as well...
>
> But before I start doing that, I need some review and general agreement
> on the design. What I don't want to happen is that three days after the
> feature freeze, someone finally looks at it and finds a major issue or
> just thinks it's an unreadable mess, and we no longer have the time to
> fix it.
>
> One question that I'm sure someone will ask is do we need this if we
> have bitmap indexes? Both aim at having a smaller index, after all. The
> use cases are quite different; GIT is effective whenever you have a
> table that's reasonably well-clustered. Unlike the bitmap indexam, GIT's
> effectiveness doesn't depend on the number of distinct values, in
> particular it works well with unique indexes. GIT is comparable to
> clustered indexes in other DBMSs (in fact we might want to call GIT that
> in the end).
>
> --
> Heikki Linnakangas
> EnterpriseDB http://www.enterprisedb.com
>
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--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://postgres.enterprisedb.com

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