com.couchbase.lite.View view1 = database.getView("test6"); view1.setMapReduce( new Mapper() { @Override public void map(Map<String, Object> document, Emitter emitter) { if(document.containsKey("foo")) { emitter.emit(document.get("foo"), 1); } } }, new Reducer() { public Object reduce(List<Object> keys, List<Object> values, boolean rereduce) { return keys; } }, "1.0");

https://developer.couchbase.com/documentation/mobile/1.4/guides/couchbase-lite/native-api/view/index.html

to get the unique values only: view1.setMapReduce( new Mapper() { @Override public void map(Map<String, Object> document, Emitter emitter) { if(document.containsKey("foo")) { Map<String, String> map = new HashMap<String, String>(); map.put((String)document.get("foo"),(String)document.get("foo")); emitter.emit(map,null); } } }, new Reducer() { public Object reduce(List<Object> keys, List<Object> values, boolean rereduce) { Set skeys = new HashSet(keys); List ukeys = new ArrayList(skeys); return ukeys; } }, "1.0"); 08.05.17

https://github.com/couchbaselabs/mini-hacks/tree/master/kitchen-sync/android

to get the unique values via the query use setGroupLevel: Query query = view1.createQuery(); query.setMapOnly(true); query.setGroupLevel(1); 08.05.17

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