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https://issues.apache.org/jira/browse/HIVE-13285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15195866#comment-15195866
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Gopal V commented on HIVE-13285:
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LGTM - +1, tests pending.
> Orc concatenation may drop old files from moving to final path
> --------------------------------------------------------------
>
> Key: HIVE-13285
> URL: https://issues.apache.org/jira/browse/HIVE-13285
> Project: Hive
> Issue Type: Bug
> Components: ORC
> Affects Versions: 0.14.0, 1.0.0, 1.2.0, 1.1.0, 1.3.0, 2.0.0, 2.1.0
> Reporter: Prasanth Jayachandran
> Assignee: Prasanth Jayachandran
> Priority: Critical
> Attachments: HIVE-13285.1.patch, HIVE-13285.2.patch,
> HIVE-13285.3.patch
>
>
> ORC concatenation uses combine hive input format for merging files. Under
> specific case where all files within a combine split are incompatible for
> merge (old files without stripe statistics) then these files are added to
> incompatible file set. But this file set is not processed as closeOp() will
> not be called (no output file writer will exist which will skip
> super.closeOp()). As a result, these incompatible files are not moved to
> final path.
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