From: Andreas Ericsson Date: Thu, 06 Sep 2007 08:49:23 GMT Subject: Re: Git's database structure Message-ID: <46DFBF13.9040109@op5.se> In-Reply-To: <9e4733910709050912i57ed7137o6abb02ee741d394b@mail.gmail.com> Jon Smirl wrote: > On 9/5/07, Julian Phillips wrote: >> On Wed, 5 Sep 2007, Jon Smirl wrote: >> >>> On 9/5/07, Andreas Ericsson 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. > Estimated daily uses of git-blame, world-wide: few Estimated daily uses of git-{merge,diff}, worldwide: lots Code and benchmarks, or I'm not buying it. -- Andreas Ericsson andreas.ericsson@op5.se OP5 AB www.op5.se Tel: +46 8-230225 Fax: +46 8-230231