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https://issues.apache.org/jira/browse/TAJO-2011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15046204#comment-15046204
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Jaehwa Jung commented on TAJO-2011:
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+1 for this idea
> Limitedly allow to retrieve all columns from schemaless tables
> --------------------------------------------------------------
>
> Key: TAJO-2011
> URL: https://issues.apache.org/jira/browse/TAJO-2011
> Project: Tajo
> Issue Type: New Feature
> Reporter: Jihoon Son
> Assignee: Jihoon Son
> Fix For: 0.11.1
>
>
> Schemaless table allows to easily create tables for json data. However, it is
> difficult to get any schema information or sample data because tajo doesn't
> allow to retrieve all columns from schemaless tables. The reason why tajo
> doesn't support it is, it is impossible to get the entire schema before
> retrieving whole data. So, it is very difficult to consistently print the
> final result.
> IMO, it will be useful for uses even if tajo allows to do it limitedly. To
> prevent from using too much memory, retrieving all columns needs to be
> allowed only when it is used with LIMIT clause together.
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