[RFC] Adding specialized indexes to speed up slow operations

["Martin Langhoff (CatalystIT)" <martin@catalyst.net.nz>]

The git internal storage model is optimized for some operations (those 
that Linus considers common in his workflow), while some other commands 
end up being rather expensive, like git-whatchanged 
/some/deep/path/file.c or git-log /someother/file/deep/in/the/tree.c

For some stuff I'm working on (cvs daemon emulation) my plan is to have 
a stupid && rebuildable set of indexes to speed up cvs-like annotates 
and per-file cvs-like changelogs. Knowing very little about efficient 
data structures, I'll probably use something uninspiring like SQLite. 
But it's one of those things that perhaps belongs in the core -- not 
cvs-like stuff, but utilities to build and maintain some specialized 
indexes.

cheers,


martin
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