--! qt:dataset:src
set hive.mapred.mode=nonstrict;
set hive.map.aggr=true;
set hive.groupby.skewindata=true;
set mapred.reduce.tasks=31;

CREATE TABLE dest1_n10(key STRING, c1 INT, c2 STRING) STORED AS TEXTFILE;

EXPLAIN
FROM src
INSERT OVERWRITE TABLE dest1_n10 SELECT substr(src.key,1,1), count(DISTINCT substr(src.value,5)), concat(substr(src.key,1,1),sum(substr(src.value,5))) GROUP BY substr(src.key,1,1);

FROM src
INSERT OVERWRITE TABLE dest1_n10 SELECT substr(src.key,1,1), count(DISTINCT substr(src.value,5)), concat(substr(src.key,1,1),sum(substr(src.value,5))) GROUP BY substr(src.key,1,1);

SELECT dest1_n10.* FROM dest1_n10 order by key;