Github user jinossy commented on the pull request:
https://github.com/apache/tajo/pull/311#issuecomment-76879983
Iâve successfully tested by real data on my company cluster.
* ENV
* 2 TajoMaster + 4 TajoWorker
* JDK 1.7.0_67
* 1G Network
```
Json Table
2TB compressed by snappy
7.3TB Actual bytes
select count(*) from (select id from table1 group by id) t1;
Progress: 100%, response time: 3546.781 sec
?count
-------------------------------
2802809536
(1 rows, 3546.781 sec, 11 B selected)
Parquet table
8.1TB compressed by snappy
select count(*) from table2
Progress: 100%, response time: 374.358 sec
?count
-------------------------------
16090817643
(1 rows, 374.358 sec, 12 B selected)
```
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