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https://issues.apache.org/jira/browse/TAJO-1402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14360175#comment-14360175
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Hyunsik Choi commented on TAJO-1402:
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This is a significant and breaking change to force users to change their UDF
functions. So, if there is an alternative solution, feel free to suggest me.
> 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.
> But, EvalNode also should return TypeDesc in order to enable the logical
> planner to support nested schema.
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