BDB btree vs. BDB hash format

Hi,

what is the main motivation for SpamProbe to use BDB btree format
instead of BDB hash format? The tree structure of the btree format
doesn't seem to be required or exploited somewhere (except that
exports are output in sorted order), so the BDB hash format should
suffice. It shouldn't have the typical btree problems like removed
keys whose allocated space is rarely re-used later. Performance should
be better, too.

Using BDB hash should be somewhere between using SP's fixed hash
format and using SP's btree format: it would be (almost) as fast as
the fixed hash format, yet it would still store original keywords
instead of hashes.


Greetings,
Thomas.


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