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https://issues.apache.org/jira/browse/HIVE-3149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13296063#comment-13296063
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Kevin Wilfong commented on HIVE-3149:
-------------------------------------
Submitted a diff here https://reviews.facebook.net/D3693
> Dynamically generated paritions deleted by Block level merge
> ------------------------------------------------------------
>
> Key: HIVE-3149
> URL: https://issues.apache.org/jira/browse/HIVE-3149
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Kevin Wilfong
> Assignee: Kevin Wilfong
> Priority: Critical
> Fix For: 0.10.0
>
>
> When creating partitions in a table using dynamic partitions and a Block
> level merge is executed at the end of the query, some partitions may be lost.
> Specifically if the values of two or more dynamic partition keys end in the
> same sequence of numbers, all but the largest will be dropped.
> I was not able to confirm it, but I suspect that if a map reduce job is
> speculated as part of the merge, the duplicate data will not be deleted
> either.
> E.g.
> insert overwrite table merge_dynamic_part partition (ds = '2008-04-08', hr)
> select key, value, if(key % 2 == 0, 'a1', 'b1') as hr from
> srcpart_merge_dp_rc where ds = '2008-04-08';
> In this query, if a Block level merge is executed at the end, only one of the
> partitions ds=2008-04-08/hr=a1 and ds=2008-04-08/hr=b1 will appear in the
> final table.
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