string funcList = ConfigurationManager.AppSettings["FilterTransactionFunctionList"] as string;
               var filterList = funcList.Split(',');

               var wclLogCursor = wclMongoDB.GetCollection<CallLog>("CallLog").Find(
                    Query<CallLog>.Where(p => p.CreateDateTime >= start.ToUniversalTime() && p.CreateDateTime <= end.ToUniversalTime())
                    );

               var match = new BsonDocument 
                {
                    { "$match",
                       new BsonDocument {{ "CreateDateTime", new BsonDocument {
                                            {"$gte", start.ToUniversalTime() },
                                            {"$lte",  end.ToUniversalTime()  }
                                        }}
                       }
                       
                }};

               var group = new BsonDocument
                { 
                    { "$group", 
                        new BsonDocument
                        { 
                            { "_id", new BsonDocument {{"FunctionSessionId", "$FunctionSessionId" }}}, 
                            {"CallLogKey", new BsonDocument {{"$first", "$CallLogKey" }}}, 
                            {"CallSessionId", new BsonDocument {{"$first", "$CallSessionId" }}}, 
                            {"CreateDateTime", new BsonDocument {{"$first", "$CreateDateTime" }}}, 
                            {"LastCreateDateTime", new BsonDocument {{"$last", "$CreateDateTime" }}}, 
                            {"FunctionName", new BsonDocument {{"$first", "$FunctionName" }}}, 
                            {"Duration", new BsonDocument {{"$first", "$Duration" }}}, 
                            {"Direction", new BsonDocument {{"$first", "$Direction" }}}, 
                            {"Target", new BsonDocument {{"$first", "$Target" }}}, 
                            {"UICode", new BsonDocument {{"$first", "$UICode" }}}, 
                            {"UserName", new BsonDocument {{"$first", "$UserName" }}}, 
                            {"IsSucceed", new BsonDocument {{"$first", "$IsSucceed" }}}, 
                            {"FunctionCount", new BsonDocument {{"$sum", 1}}},
                            {"Request", new BsonDocument {{"$first", "$CallParameters" }}}, 
                            {"Response", new BsonDocument {{"$last", "$CallParameters" }}}
                        } 
                    } 
                  };

               var sort = new BsonDocument
                {
                    {
                        "$sort",
                        new BsonDocument
                        {
                            {"CreateDateTime", 1} , {"CreateDateTime.getTime()", 1}, 
                        }
                    }
                };
               var filterFunctions = new BsonDocument 
                {
                    { "$match",
                     new BsonDocument {{ "FunctionName", new BsonDocument {
                                            {"$nin", new BsonArray(filterList) }
                                        }}}
                       }
                       
                };

               var project = new BsonDocument
                { 
                    { 
                        "$project", 
                        new BsonDocument
                            { 
                                {"_id", 0}, 
                                {"CallLogKey", "$CallLogKey"},
                                {"CallSessionId", "$CallSessionId"},
                                {"CreateDateTime","$CreateDateTime"}, 
                                {"FunctionSessionId","$_id.FunctionSessionId"}, 
                                {"FunctionName","$FunctionName"},
                                {"Duration", new BsonDocument(
                                                "$subtract",
                                                new BsonArray() {"$LastCreateDateTime","$CreateDateTime"}
                                             )}, 
                                {"Direction","$Direction"}, 
                                {"Target","$Target"}, 
                                {"UICode","$UICode"}, 
                                {"UserName","$UserName"}, 
                                {"IsSucceed","$IsSucceed"},
                                {"FunctionCount","$FunctionCount"}, 
                                {"Request","$Request"}, 
                                {"Response","$Response"}, 
                            } 
                    } 
                };

               var limit = new BsonDocument("$limit", 1000);
               var pipeline = new AggregateArgs()
               {
                   AllowDiskUse = true,
                   OutputMode = AggregateOutputMode.Cursor,
                   Pipeline = new[] { match, sort, group, filterFunctions, project }
               };

               var result = wclLogCursor.Collection.Aggregate(pipeline);