[TAJO-1833] Refine LogicalPlanPreprocessor to add new rules easily

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.11.0
• Component/s: Planner/Optimizer
• Assignee: Jihoon Son
• Reporter: Jihoon Son
• Created: 10/Sep/15 05:34
• Updated: 10/Sep/15 13:27
• Resolved: 10/Sep/15 13:03

Description

LogicalPlanPreprocessor is responsible for building base schema information. So far, it has been enough to do this.
However, to support self-describing data formats well (TAJO-1832), the current architecture is difficult to fulfil the requirements.

To make good use of self-described data format information, schema can be guessed at query runtime. I think that this should be done between logical plan preprocessing phase and logical planning phase. However, guessing schema is also a duty of LogicalPlanPreprocessor, that is building base schema information.

For the sake of generality and extensibility, I think we need to refine LogicalPlanPreprocessor to add new rules easily.

Issue Links

• is required by: TAJO-1832 Well support for self-describing data formats