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https://issues.apache.org/jira/browse/TAJO-2136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyunsik Choi updated TAJO-2136:
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Summary: (Umbrella) Optimizer transforms plans instead of modifying them.
(was: Optimizer transforms plans instead of modifying them.)
> (Umbrella) Optimizer transforms plans instead of modifying them.
> ----------------------------------------------------------------
>
> Key: TAJO-2136
> URL: https://issues.apache.org/jira/browse/TAJO-2136
> Project: Tajo
> Issue Type: Improvement
> Components: Planner/Optimizer
> Reporter: Hyunsik Choi
>
> Many bugs and inconsistent meta data of the Plan and MasterPlan
> representation are being caused by modification. We need to refactor the
> optimizer and rules to transform immutable data representation instead of
> modifying them.
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