Striped queries
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Key: COUCHDB-244
URL: https://issues.apache.org/jira/browse/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 key.
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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