On Sun, Oct 12, 2008 at 12:37 AM, Matt Amos <[EMAIL PROTECTED]> wrote: > On Sun, Oct 12, 2008 at 12:32 AM, Frederik Ramm <[EMAIL PROTECTED]> wrote: >> Matt Amos wrote: >>> yeah, maybe its worth having a previous_version column in >>> current_(nodes|ways|relations) for efficient lookup? >> >> Mh. *That* would always be version-1 (version is auto-incremented on every >> update). > > would it? would it be worth not assuming this? we could allow other > version ID allocations. for example, i think it would be useful to > allocate version IDs globally, like subversion does, so that each > version ID uniquely identifies all elements which were atomically > committed together.
Much as I dislike quoting from wikis... "Are there cases where new version number != old version number + 1?" --Frederik Ramm 14:06, 5 May 2008 (UTC) "Possibly no. But in the future with transactional updates we decided we couldn't necessarily rule out the possibility that numbers might be skipped, depending on where exactly the numbers were generated. So we decided to play it safe: less assumptions is good." -- Kleptog Cheers, Andy _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
