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https://issues.apache.org/jira/browse/HIVE-12451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15009989#comment-15009989
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Prasanth Jayachandran commented on HIVE-12451:
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[~ekoifman] fyi..
> Orc fast file merging/concatenation should be disabled for ACID tables
> ----------------------------------------------------------------------
>
> Key: HIVE-12451
> URL: https://issues.apache.org/jira/browse/HIVE-12451
> Project: Hive
> Issue Type: Bug
> Affects Versions: 1.3.0, 2.0.0
> Reporter: Prasanth Jayachandran
> Assignee: Prasanth Jayachandran
>
> For ACID tables merging of small files should happen only through compaction.
> We should disable "alter table .. concatenate" for ACID tables. We should
> also disable ConditionalMergeFileTask if destination is an ACID table.
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