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https://issues.apache.org/jira/browse/TAJO-1402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14360329#comment-14360329
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Jihoon Son commented on TAJO-1402:
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Even though this issue requires a lot of changes, it seems to be difficult to
avoid them.
> 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: 0.11.0
>
>
> 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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