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From "Hyunsik Choi (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (TAJO-1402) EvalNode should have TypeDesc instead of DataType as a return type.
Date Sun, 03 Dec 2017 23:59:00 GMT

     [ https://issues.apache.org/jira/browse/TAJO-1402?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hyunsik Choi updated TAJO-1402:
-------------------------------
    Fix Version/s:     (was: 0.12.0)
                   0.13.0

> EvalNode should have TypeDesc instead of DataType as a return type.
> -------------------------------------------------------------------
>
>                 Key: TAJO-1402
>                 URL: https://issues.apache.org/jira/browse/TAJO-1402
>             Project: Tajo
>          Issue Type: Improvement
>            Reporter: Hyunsik Choi
>            Assignee: Hyunsik Choi
>             Fix For: 0.13.0
>
>
> DataType is a protobuf type, which does not allow recursive nested data structure. To
solve this problem, I made TypeDesc which represent recursive nested schemas in TAJO-1329.
It is enough to represent just schemas.
> However, in order to enable the logical planner to support fully nested schema, EvalNode
also has TypeDesc as a return type. This is because users can project nested primitive fields
as well as nested record itself.



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