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https://issues.apache.org/jira/browse/HIVE-11410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14648854#comment-14648854
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Matt McCline commented on HIVE-11410:
-------------------------------------
By the way, thank you for the create repro description.
> Join with subquery containing a group by incorrectly returns no results
> -----------------------------------------------------------------------
>
> Key: HIVE-11410
> URL: https://issues.apache.org/jira/browse/HIVE-11410
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: 1.1.0
> Reporter: Nicholas Brenwald
> Assignee: Matt McCline
> Priority: Minor
> Attachments: hive-site.xml
>
>
> Start by creating a table *t* with columns *c1* and *c2* and populate with 1
> row of data. For example create table *t* from an existing table which
> contains at least 1 row of data by running:
> {code}
> create table t as select 'abc' as c1, 0 as c2 from Y limit 1;
> {code}
> Table *t* looks like the following:
> ||c1||c2||
> |abc|0|
> Running the following query then returns zero results.
> {code}
> SELECT
> t1.c1
> FROM
> t t1
> JOIN
> (SELECT
> t2.c1,
> MAX(t2.c2) AS c2
> FROM
> t t2
> GROUP BY
> t2.c1
> ) t3
> ON t1.c2=t3.c2
> {code}
> However, we expected to see the following:
> ||c1||
> |abc|
> The problem seems to relate to the fact that in the subquery, we group by
> column *c1*, but this is not subsequently used in the join condition.
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