[jira] [Commented] (TAJO-224) Rearrange DataType enumeration and Refactor type systems

["Hyunsik Choi (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TAJO-224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13783722#comment-13783722 ] 

Hyunsik Choi commented on TAJO-224:
-----------------------------------

I've verify 'mvn clean install', and I've tested this patch on a real cluster with TPC-H 1, 3, 6 queries. It works well.

> 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
>
>         Attachments: TAJO-224.patch
>
>
> 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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