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From "Frederik Fix (JIRA)" <>
Subject [jira] Created: (COUCHDB-244) Striped queries
Date Tue, 10 Feb 2009 12:09:01 GMT
Striped queries

                 Key: COUCHDB-244
             Project: CouchDB
          Issue Type: New Feature
          Components: Database Core
            Reporter: Frederik Fix
         Attachments: striped_queries.diff

I have implemented striped queries, where you can specify multiple startkey/endkey ranges
in a single request. As a nice side effect this allows faceted search (for discrete keys).
Heres an example:

Say I have the following map function:

function() {
  emit([doc.rooms, doc.price], doc);

where doc.rooms and doc.price are both integers. Now lets say i want to find every document
with a number of rooms between 2 and 4 and a price between 100 and 1000. I can then do the
following query:

db.view("my_view",{},{stripes: [{startkey: [2, 100], endkey: [2, 1000]}, {startkey: [3, 100],
endkey: [3, 1000]}, {startkey: [4, 100], endkey: [4, 1000]}]});

If the view included a reduce function that would work too.

As you can probably see this patch introduced a change to the JS API (but not the HTTP). The
keys parameter is now a hash which can either take a keys param or a stripes. The keys param
works as before. The stripes param takes an array of hashes each having a startkey, endkey

The state of the patch is still somewhat raw, with no error checking on the stripes part of
the API. Furthermore it might be useful to extend the limit, skip and descending options to
the stripes.

The patch is against the current trunk version (rev 742925) and all tests pass.

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