Hi Manuel, I believe that in a single property index, entries with the same value are sorted by key, therefore the results of a merge join will always be in key order. If you can ensure that your tag entities have keys in chronological order then this should be possible. I am not certain but I think that auto generated ids (as opposed to key names) are not guaranteed to be in order so you would probably need to set the key name yourself from a counter. Perhaps you could use memcaches increment method here?
John On Dec 5, 10:35 pm, Manuel <[email protected]> wrote: > Hi, > > I'm thinking of using merge-joins to implement AND-queries in a > tagging system. > > Is there some way (that doesn't involve sorting in RAM) of using merge- > joins to return items that have two or more tags in (reverse) > chronological order? > > Thanks, > Manuel -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
