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From "Jihoon Son (JIRA)" <j...@apache.org>
Subject [jira] [Created] (TAJO-481) Logical plan refactoring
Date Tue, 07 Jan 2014 09:27:53 GMT
Jihoon Son created TAJO-481:

             Summary: 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
* 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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