/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

---------------------------------------------------------------------
-- Top N Queries with Macro
---------------------------------------------------------------------

DEFINE my_macro_1 (QUERY, A) RETURNS C {
    $C = FOREACH $QUERY GENERATE group AS query, SUM(data.$A) AS count;
} ;

data =
    LOAD '$input'
    AS (query:CHARARRAY, count:INT);

queries_group = 
    GROUP data 
    BY query
    PARALLEL $reducers;

queries_sum = my_macro_1(queries_group, count);

queries_ordered = 
    ORDER queries_sum 
    BY count DESC
    PARALLEL $reducers;
            
queries_limit = LIMIT queries_ordered $n;

STORE queries_limit INTO '$output';