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From "Ivan Erceg (JIRA)" <j...@apache.org>
Subject [jira] [Created] (COUCHDB-2190) Allow "skip" to be negative
Date Thu, 06 Mar 2014 17:42:43 GMT
Ivan Erceg created COUCHDB-2190:
-----------------------------------

             Summary: Allow "skip" to be negative
                 Key: COUCHDB-2190
                 URL: https://issues.apache.org/jira/browse/COUCHDB-2190
             Project: CouchDB
          Issue Type: Improvement
      Security Level: public (Regular issues)
          Components: HTTP Interface
            Reporter: Ivan Erceg


I propose to allow "skip" to be a negative value in order to minimise the number of requests
and/or the amount of data that has to be retrieved.

An example: I have a key for a reduce and I want to find the next and the previous keys in
a single request. If "skip" was allowed to be negative I could make a query with skip -1 and
limit +3 thus retrieving the previous, the current and the next keys. I for one can't think
of an alternative solution (though I'm a relative newbie in CouchDb) that would allow to do
this in a single request.

Considering how skip works (if I understand it correctly), there shouldn't be any technical
impediment to search the B-tree for the given key, take one (or more) steps back (in the same
way we take them forward for skip > 0) and then retrieve the data from there.



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