-- SORT_QUERY_RESULTS

CREATE TABLE dest_j1(key STRING, value STRING, val2 STRING) STORED AS TEXTFILE;

set hive.auto.convert.join=true;
set hive.auto.convert.join.noconditionaltask=true;
set hive.auto.convert.join.noconditionaltask.size=10000;

-- Since the inputs are small, it should be automatically converted to mapjoin

EXPLAIN EXTENDED
INSERT OVERWRITE TABLE dest_j1
SELECT x.key, x.value, subq1.value
FROM 
( SELECT x.key as key, x.value as value from src x where x.key < 20
     UNION ALL
  SELECT x1.key as key, x1.value as value from src x1 where x1.key > 100
) subq1
JOIN src1 x ON (x.key = subq1.key);

INSERT OVERWRITE TABLE dest_j1
SELECT x.key, x.value, subq1.value
FROM 
( SELECT x.key as key, x.value as value from src x where x.key < 20
     UNION ALL
  SELECT x1.key as key, x1.value as value from src x1 where x1.key > 100
) subq1
JOIN src1 x ON (x.key = subq1.key);

select * from dest_j1;