1 files changed, 169 insertions, 0 deletions
diff --git a/share/www/script/test/reduce.js b/share/www/script/test/reduce.js
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+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License.  You may obtain a copy
+// of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+couchTests.reduce = function(debug) {
+  var db = new CouchDB("test_suite_db");
+  db.deleteDb();
+  db.createDb();
+  if (debug) debugger;
+  var numDocs = 500
+  var docs = makeDocs(1,numDocs + 1);
+  T(db.bulkSave(docs).ok);
+  var summate = function(N) {return (N+1)*N/2;};
+
+  var map = function (doc) {
+      emit(doc.integer, doc.integer);
+      emit(doc.integer, doc.integer)};
+  var reduce = function (keys, values) { return sum(values); };
+  var result = db.query(map, reduce);
+  T(result.rows[0].value == 2*summate(numDocs));
+
+  result = db.query(map, reduce, {startkey: 4, endkey: 4});
+  T(result.rows[0].value == 8);
+
+  result = db.query(map, reduce, {startkey: 4, endkey: 5});
+  T(result.rows[0].value == 18);
+
+  result = db.query(map, reduce, {startkey: 4, endkey: 6});
+  T(result.rows[0].value == 30);
+
+  result = db.query(map, reduce, {group:true, limit:3});
+  T(result.rows[0].value == 2);
+  T(result.rows[1].value == 4);
+  T(result.rows[2].value == 6);
+
+  for(var i=1; i<numDocs/2; i+=30) {
+    result = db.query(map, reduce, {startkey: i, endkey: numDocs - i});
+    T(result.rows[0].value == 2*(summate(numDocs-i) - summate(i-1)));
+  }
+
+  db.deleteDb();
+  db.createDb();
+
+  for(var i=1; i <= 5; i++) {
+
+    for(var j=0; j < 10; j++) {
+      // these docs are in the order of the keys collation, for clarity
+      var docs = [];
+      docs.push({keys:["a"]});
+      docs.push({keys:["a"]});
+      docs.push({keys:["a", "b"]});
+      docs.push({keys:["a", "b"]});
+      docs.push({keys:["a", "b", "c"]});
+      docs.push({keys:["a", "b", "d"]});
+      docs.push({keys:["a", "c", "d"]});
+      docs.push({keys:["d"]});
+      docs.push({keys:["d", "a"]});
+      docs.push({keys:["d", "b"]});
+      docs.push({keys:["d", "c"]});
+      T(db.bulkSave(docs).ok);
+      T(db.info().doc_count == ((i - 1) * 10 * 11) + ((j + 1) * 11));
+    }
+
+    map = function (doc) {emit(doc.keys, 1)};
+    reduce = function (keys, values) { return sum(values); };
+
+    var results = db.query(map, reduce, {group:true});
+
+    //group by exact key match
+    T(equals(results.rows[0], {key:["a"],value:20*i}));
+    T(equals(results.rows[1], {key:["a","b"],value:20*i}));
+    T(equals(results.rows[2], {key:["a", "b", "c"],value:10*i}));
+    T(equals(results.rows[3], {key:["a", "b", "d"],value:10*i}));
+
+    // test to make sure group reduce and limit params provide valid json
+    var results = db.query(map, reduce, {group: true, limit: 2});
+    T(equals(results.rows[0], {key: ["a"], value: 20*i}));
+    T(equals(results.rows.length, 2));
+
+    //group by the first element in the key array
+    var results = db.query(map, reduce, {group_level:1});
+    T(equals(results.rows[0], {key:["a"],value:70*i}));
+    T(equals(results.rows[1], {key:["d"],value:40*i}));
+
+    //group by the first 2 elements in the key array
+    var results = db.query(map, reduce, {group_level:2});
+    T(equals(results.rows[0], {key:["a"],value:20*i}));
+    T(equals(results.rows[1], {key:["a","b"],value:40*i}));
+    T(equals(results.rows[2], {key:["a","c"],value:10*i}));
+    T(equals(results.rows[3], {key:["d"],value:10*i}));
+    T(equals(results.rows[4], {key:["d","a"],value:10*i}));
+    T(equals(results.rows[5], {key:["d","b"],value:10*i}));
+    T(equals(results.rows[6], {key:["d","c"],value:10*i}));
+  }
+
+  // now test out more complex reductions that need to use the combine option.
+
+  db.deleteDb();
+  db.createDb();
+
+
+  var map = function (doc) {emit(doc.val, doc.val)};
+  var reduceCombine = function (keys, values, rereduce) {
+      // This computes the standard deviation of the mapped results
+      var stdDeviation=0.0;
+      var count=0;
+      var total=0.0;
+      var sqrTotal=0.0;
+
+      if (!rereduce) {
+        // This is the reduce phase, we are reducing over emitted values from
+        // the map functions.
+        for(var i in values) {
+          total = total + values[i];
+          sqrTotal = sqrTotal + (values[i] * values[i]);
+        }
+        count = values.length;
+      }
+      else {
+        // This is the rereduce phase, we are re-reducing previosuly
+        // reduced values.
+        for(var i in values) {
+          count = count + values[i].count;
+          total = total + values[i].total;
+          sqrTotal = sqrTotal + values[i].sqrTotal;
+        }
+      }
+
+      var variance =  (sqrTotal - ((total * total)/count)) / count;
+      stdDeviation = Math.sqrt(variance);
+
+      // the reduce result. It contains enough information to be rereduced
+      // with other reduce results.
+      return {"stdDeviation":stdDeviation,"count":count,
+          "total":total,"sqrTotal":sqrTotal};
+    };
+
+    // Save a bunch a docs.
+
+  for(var i=0; i < 10; i++) {
+    var docs = [];
+    docs.push({val:10});
+    docs.push({val:20});
+    docs.push({val:30});
+    docs.push({val:40});
+    docs.push({val:50});
+    docs.push({val:60});
+    docs.push({val:70});
+    docs.push({val:80});
+    docs.push({val:90});
+    docs.push({val:100});
+    T(db.bulkSave(docs).ok);
+  }
+  
+  var results = db.query(map, reduceCombine);
+  
+  var difference = results.rows[0].value.stdDeviation - 28.722813232690143;
+  // account for floating point rounding error
+  T(Math.abs(difference) < 0.0000000001);
+  
+};