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https://issues.apache.org/jira/browse/HIVE-18380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16317481#comment-16317481
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Eugene Koifman commented on HIVE-18380:
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I think concatenating/compacting contiguous deltas should be possible - there
is no technical reason it can't be.
> ALTER TABLE CONCATENATE is not supported on Micro-managed table
> ---------------------------------------------------------------
>
> Key: HIVE-18380
> URL: https://issues.apache.org/jira/browse/HIVE-18380
> Project: Hive
> Issue Type: Bug
> Components: Transactions
> Affects Versions: 3.0.0
> Reporter: Steve Yeom
> Priority: Minor
>
> ALTER TABLE CONCATENATE is not supported on Micro-managed table.
> Example qtest is "alter_merge_2_orc.q" and the unsupportability is revealed
> when we start with tables in micro-managed table type(insert_only
> transactional).
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