Jihoon Son created TAJO-481:
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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 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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