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https://issues.apache.org/jira/browse/HIVE-8089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14137966#comment-14137966
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Sergey Shelukhin commented on HIVE-8089:
----------------------------------------
At first glance it seems by design... ordering of the table is not preserved
(or at least there's no guarantee about ordering) when one selects from a table
w/o order by. So, why should it be preserved from subquery?
> Ordering is lost when limit is put in outer query
> -------------------------------------------------
>
> Key: HIVE-8089
> URL: https://issues.apache.org/jira/browse/HIVE-8089
> Project: Hive
> Issue Type: Bug
> Reporter: Laljo John Pullokkaran
>
> It seems like hive supports order by, limit in sub queries (compiler doesn't
> complain). However ordering seems to be lost based on where you place the
> limit. I haven't debugged the issue.
> ex:
> select key, c_int from (select key, c_int from (select key, c_int from t1
> order by c_int limit 5)t1)t1;
> null NULL
> null NULL
> 1 1
> 1 1
> 1 1
> select key, c_int from (select key, c_int from (select key, c_int from t1
> order by c_int)t1 limit 5)t1;
> 1 1
> 1 1
> 1 1
> null NULL
> null NULL
> select key, c_int from (select key, c_int from (select key, c_int from t1
> order by c_int limit 5)t1 limit 5)t1;
> 1 1
> 1 1
> 1 1
> null NULL
> null NULL
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