Hyunsik Choi created TAJO-224:
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Summary: Rearrange DataType enumeration and Refactor type systems
Key: TAJO-224
URL: https://issues.apache.org/jira/browse/TAJO-224
Project: Tajo
Issue Type: Improvement
Components: physical operator, planner/optimizer
Reporter: Hyunsik Choi
Assignee: Hyunsik Choi
Fix For: 0.2-incubating
This patch rebuilds DataType enumeration and refactors type systems for more
efficiency and extendibility of type. In detail, it does as follows:
* Remove the array return value from EvalNode, all functions, Catalog.
** Now, all operators, functions, and expressions return only one data type.
** Instead, a data type can be array.
* Add Type.PROTOBUF type that enables Tajo uses a protocol buffer class as a
type.
* Remove ArrayDatum and Type.Array which are used in some functions, requiring
return two or more values.
** Instead, they use generated protobuf type as return types.
* Add more rich data types to DataType.Type.
* Add ProtobufDatum and ProtobufDatumFactory that help create Builder with only
a data type.
* Cleanup Catalog and many others.
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