[MERGE] Support empty keys when looking for common prefixes in CHKMap.

[Jelmer Vernooij]

On Wed, May 13, 2009 at 05:05:32PM -0500, John Arbash Meinel wrote:
> Jelmer Vernooij wrote:
> > Trivial issue found by bzr-svn's file id map implementation based on
> > CHKMap, which uses the entry ('',) that would otherwise cause "local
> > variable pos not set" exceptions.
> BB:approve

> Out of curiosity, are you using a hash function for the search key?

Not that I'm aware of.. I'm just using 1-tuples with the path of each
file/directory. How would a hash function help exactly? More efficient
in terms of disk space, better performance? I still need to iterate
over all keys in a CHKMap, so I would have to store them elsewhere I
guess if I used a hash function.

Cheers,

Jelmer
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