[jira] [Resolved] (TAJO-1833) Refine LogicalPlanPreprocessor to add new rules easily

["Jihoon Son (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TAJO-1833?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jihoon Son resolved TAJO-1833.
------------------------------
       Resolution: Fixed
    Fix Version/s: 0.11.0

Committed to master and 0.11.

> 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
>             Fix For: 0.11.0
>
>
> 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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