Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/113#issuecomment-53052194
I've updated the patch. I've improved TajoTestingCluster to take system
properties as follows:
```
mvn clean install -DCODEGEN=true
```
If ```CODEGEN``` is a session variable, it will be applied to QueryContext
instance used in all unit tests. So, in order to test the code generation
feature, you should give ```-DCODEGEN=true``` when you execute ```mvn
install```. It can be used for other session variables too.
For test for real queries, you need to set a session variable CODEGEN as
follows:
```
tajo> \set CODEGEN true
tajo>
tajo> SELECT .....
```
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