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https://issues.apache.org/jira/browse/HIVE-20183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16546495#comment-16546495
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Peter Vary commented on HIVE-20183:
-----------------------------------
Trying from another direction
> Inserting from bucketed table can cause data loss, if the source table
> contains empty buckets
> ---------------------------------------------------------------------------------------------
>
> Key: HIVE-20183
> URL: https://issues.apache.org/jira/browse/HIVE-20183
> Project: Hive
> Issue Type: Bug
> Components: Operators
> Reporter: Peter Vary
> Assignee: Peter Vary
> Priority: Major
> Attachments: HIVE-20183.2.patch, HIVE-20183.patch
>
>
> Could be reproduced by the following:
> {code}
> set hive.enforce.bucketing=true;
> set hive.enforce.sorting=true;
> set hive.optimize.bucketingsorting=true;
> create table bucket1 (id int, val string) clustered by (id) sorted by (id
> ASC) INTO 4 BUCKETS;
> insert into bucket1 values (1, 'abc'), (3, 'abc');
> select * from bucket1;
> +-------------+--------------+
> | bucket1.id | bucket1.val |
> +-------------+--------------+
> | 3 | abc |
> | 1 | abc |
> +-------------+--------------+
> create table bucket2 like bucket1;
> insert overwrite table bucket2 select * from bucket1;
> select * from bucket2;
> +-------------+--------------+
> | bucket2.id | bucket2.val |
> +-------------+--------------+
> | 1 | abc |
> +-------------+--------------+
> {code}
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