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https://issues.apache.org/jira/browse/TAJO-888?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyunsik Choi updated TAJO-888:
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    Description: 
We designed the ealier DAG framework in 2011. Since then, I have faced  new 
requirements for more efficient distributed query execution and more 
optimization opportunities. Because the additional requirements require lots of 
work, I have delayed the works.

The main purpose of this issue is to record and track the additional 
requirements and new features. This is an umbrella issue. Later, we would make 
an overall refactoring plan by using these well-defined requirements.

  was:
We designed the ealier DAG framework in 2011. Since then, I have faced  new 
requirements for more efficient distributed query execution and more 
optimization opportunities. Since the requirements require lots of work, I have 
delayed them.

The main purpose of this issue is to record and track the additional 
requirements and new features. This is an umbrella issue. Later, we would make 
an overall refactoring plan by using these well-defined requirements.


> (Unbrella) Refactor DAG framework
> ---------------------------------
>
>                 Key: TAJO-888
>                 URL: https://issues.apache.org/jira/browse/TAJO-888
>             Project: Tajo
>          Issue Type: Improvement
>            Reporter: Hyunsik Choi
>
> We designed the ealier DAG framework in 2011. Since then, I have faced  new 
> requirements for more efficient distributed query execution and more 
> optimization opportunities. Because the additional requirements require lots 
> of work, I have delayed the works.
> The main purpose of this issue is to record and track the additional 
> requirements and new features. This is an umbrella issue. Later, we would 
> make an overall refactoring plan by using these well-defined requirements.



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