From: Mike Hommey <mh@glandium.org>
To: Jon Smirl <jonsmirl@gmail.com>
Cc: Julian Phillips <julian@quantumfyre.co.uk>,
Andreas Ericsson <ae@op5.se>, Theodore Tso <tytso@mit.edu>,
Junio C Hamano <gitster@pobox.com>,
Git Mailing List <git@vger.kernel.org>
Subject: Re: Git's database structure
Date: Wed, 5 Sep 2007 19:39:12 +0200 [thread overview]
Message-ID: <20070905173912.GB3396@glandium.org> (raw)
In-Reply-To: <9e4733910709050912i57ed7137o6abb02ee741d394b@mail.gmail.com>
On Wed, Sep 05, 2007 at 12:12:28PM -0400, Jon Smirl <jonsmirl@gmail.com> wrote:
> On 9/5/07, Julian Phillips <julian@quantumfyre.co.uk> wrote:
> > On Wed, 5 Sep 2007, Jon Smirl wrote:
> >
> > > On 9/5/07, Andreas Ericsson <ae@op5.se> wrote:
> > >> Jon Smirl wrote:
> > >>>
> > >>> The path name field needs to be moved back into the blobs to support
> > >>> alternative indexes. For example I want an index on the Signed-off-by
> > >>> field. I use this index to give me the SHAs for the blobs
> > >>> Signed-off-by a particular person. In the current design I have no way
> > >>> of recovering the path name for these blobs other than a brute force
> > >>> search following every path looking for the right SHA.
> > >>>
> > >>
> > >> Ah, there we go. A use-case at last :)
> >
> > But not a brilliant one. You sign off on commits not blobs. So you go
> > from the sign-off to paths, then to blobs. There is no need to go from
> > blob to path unless you deliberately introduce such a need.
>
> Use blame for an example. Blame has to crawl every commit to see if it
> touched the file. It keeps doing this until it figures out the last
> author for every line in the file. Worse case blame has to crawl every
> commit in the data store.
And why exactly would you need to change blobs to contain path for blame
to be faster ?
Or more generally, what, in the current way of git doing things,
prevents you from adding an index to $THE_DATA_YOU_LIKE, exactly ?
>From the very few use cases you've given, I see nothing preventing to
create an additional index from the data git currently uses.
Mike
next prev parent reply other threads:[~2007-09-05 17:42 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-04 15:23 Git's database structure Jon Smirl
2007-09-04 15:55 ` Andreas Ericsson
2007-09-04 16:07 ` Mike Hommey
2007-09-04 16:10 ` Andreas Ericsson
2007-09-04 16:19 ` Jon Smirl
2007-09-04 16:29 ` Andreas Ericsson
2007-09-04 17:09 ` Jeff King
2007-09-04 20:17 ` David Tweed
2007-09-04 17:21 ` Junio C Hamano
2007-09-04 16:28 ` Jon Smirl
2007-09-04 16:31 ` Andreas Ericsson
2007-09-04 16:47 ` Jon Smirl
2007-09-04 16:51 ` Andreas Ericsson
2007-09-04 17:25 ` Junio C Hamano
2007-09-04 17:44 ` Jon Smirl
2007-09-04 18:04 ` Mike Hommey
2007-09-04 19:44 ` Reece Dunn
2007-09-04 18:06 ` Junio C Hamano
2007-09-04 21:25 ` Theodore Tso
2007-09-04 21:54 ` Jon Smirl
2007-09-05 7:18 ` Andreas Ericsson
2007-09-05 13:41 ` Jon Smirl
2007-09-05 14:51 ` Andreas Ericsson
2007-09-05 15:37 ` Jon Smirl
2007-09-05 15:54 ` Julian Phillips
2007-09-05 16:12 ` Jon Smirl
2007-09-05 17:31 ` Julian Phillips
2007-09-06 1:27 ` Kyle Moffett
2007-09-05 17:39 ` Mike Hommey [this message]
2007-09-06 8:49 ` Andreas Ericsson
2007-09-06 9:09 ` Junio C Hamano
2007-09-06 11:03 ` Wincent Colaiuta
2007-09-06 12:56 ` Johannes Schindelin
2007-09-06 18:14 ` Steven Grimm
2007-09-07 0:33 ` Martin Langhoff
2007-09-05 19:52 ` Andy Parkins
2007-09-04 17:19 ` Julian Phillips
2007-09-04 17:30 ` Jon Smirl
2007-09-04 18:51 ` Andreas Ericsson
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