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https://issues.apache.org/jira/browse/HIVE-18587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16347705#comment-16347705
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Sergey Shelukhin commented on HIVE-18587:
-----------------------------------------

[~ashutoshc] the thing is, existing code that returns directories never needs 
to traverse these files, and I suspect propagating it from FSOP will be a major 
pain. E.g. MM tables have to write a separate file for that on FS, cause 
there's no good channel otherwise.

So it makes sense to do it only for the events.

> insert DML event may attempt to calculate a checksum on directories
> -------------------------------------------------------------------
>
>                 Key: HIVE-18587
>                 URL: https://issues.apache.org/jira/browse/HIVE-18587
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>            Priority: Major
>         Attachments: HIVE-18587.patch
>
>
> Looks like in union case, some code path may pass directories in newFiles. 
> Probably legacy copyData/moveData; both seem to assume that these paths are 
> files, but do not actually enforce it.



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