How do I perform a parameterized query on CouchDB

CouchDB Views do not support facetted search or fulltext search or result intersection. The couchdb-lucene plugin lets you do all these things.

http://github.com/rnewson/couchdb-lucene/tree/master

Technically this is possible if you emit for each document each set of the powerset of the tags of the document as the key. The key set element must be ordered and your query whould have to query the tags ordered, too.

function map(doc) {
  function powerset(array) { ... }

  powerset_of_tags = powerset(doc.tags)
  for(i in powerset_of_tags) {
    emit(powerset_of_tags[i], doc);
  }
}

for the doc {"hello_world" : {"id":123, "tags":["hello", "world"], "text":"Hello World"} this would emit:

{ key: [], doc: ... }
{ key: ['hello'], doc: ... }
{ key: ['world'], doc: ... }
{ key: ['hello', 'world'], doc: ... }

Although is this possible I would consider this a rather arkward solution. I don't want to imagine the disk usage of the view for a larger number of tags. I expect the number of emitted keys to grow like 2^n.