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https://issues.apache.org/jira/browse/PARQUET-278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14546294#comment-14546294
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Ryan Blue commented on PARQUET-278:
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[~tianshuo], I'm fine changing the API a bit, but using the constructors
doesn't help ensure types are valid. That's the primary reason for moving to
the Types API, whatever it ends up looking like.
> enforce non empty group on MessageType level
> --------------------------------------------
>
> Key: PARQUET-278
> URL: https://issues.apache.org/jira/browse/PARQUET-278
> Project: Parquet
> Issue Type: Improvement
> Reporter: Tianshuo Deng
>
> As columnar format, parquet currently does not support empty struct/group
> without leaves. We should throw when constructing an empty GroupType to give
> a clear message.
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