Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/322#issuecomment-68272663
I carried out some simple benchmark in terms of serialized data size and
(de)serialization speed. Protobuf-based serialization outperforms both
serialized size and serialization speed. They also have similar deserialization
speed.
Test query:
```
create table store1 as select p.deptName, sumtest(score) from dept as p,
score group by p.deptName.
```
## Size
* JSON serialized size: 9,597 bytes
* Protobuf serialized size: 2,131 bytes
## Speed
I used 10,000 iteration to measure times of serialization and
deserialization.
*Json*
* Serialization: 5,265 msec
* Deserialization; 10,269 msec
*Protobuf*
* Serialization: 1,779 msec
* Deserialization: 10244 msec
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