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https://issues.apache.org/jira/browse/TAJO-481?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13865510#comment-13865510
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Jihoon Son commented on TAJO-481:
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In this issue, I'll make a simple tree structure discussed in TAJO-483.
> Logical plan refactoring
> ------------------------
>
> Key: TAJO-481
> URL: https://issues.apache.org/jira/browse/TAJO-481
> Project: Tajo
> Issue Type: Improvement
> Components: distributed query plan, planner/optimizer
> Affects Versions: 0.8-incubating
> Reporter: Jihoon Son
> Assignee: Jihoon Son
>
> The current logical plan has some problems such as requiring a complex logic
> to make a master plan, hard to be extended to support multiple outputs, and
> inefficient de/serialization.
> In this issue, we improve the logical plan to handle these problems. We
> should reflect the followings.
> * Change the logical plan from tree to DAG to easily support multiple outputs
> * Enable to connect logical nodes and data channels
> ** This makes GlobalPlanner simpler, since it removes complex codes for scan
> node creation.
> ** Data channel has two types of materialized data channel and stream data
> channel (for the future). The materialized data channel should contain the
> store information for sender and the scan information for receiver.
> * Refactor the de/serialization of logical plan
> * Add a compare tool and hash tool for logical nodes
> ** During the query planning, logical nodes are compared and hashed in
> various ways. To support various comparison and hashing, we need a new class
> such as LogicalNodeComparator and LogicalNodeHashCoder
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