Jihoon Son created TAJO-1833:
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Summary: Refine LogicalPlanPreprocessor to add new rules easily
Key: TAJO-1833
URL: https://issues.apache.org/jira/browse/TAJO-1833
Project: Tajo
Issue Type: Task
Components: Planner/Optimizer
Reporter: Jihoon Son
Assignee: Jihoon Son
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.
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